| Allowance for Loan Losses [Abstract] | Period [Axis] |
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2016-01-01 - 2016-12-31 |
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Allowance for Loan Losses [Abstract] | |
Allowance for Credit Losses on Financing Receivables [Table Text Block] | The following table summarizes the rollforward of the allowance for loan losses by portfolio segment (in thousands). | | | BALANCE AT
DECEMBER 31,
2015 | | CHARGE-
OFFS | | RECOVERIES | | PROVISION
(CREDIT) | | BALANCE AT
DECEMBER 31,
2016 | | Commercial | | $ | 4,244 | | | $ | (3,648 | ) | | $ | 140 | | | $ | 3,305 | | | $ | 4,041 | | | Commercial loans secured by real estate | | | 3,449 | | | | (13 | ) | | | 40 | | | | 108 | | | | 3,584 | | | Real estate-mortgage | | | 1,173 | | | | (291 | ) | | | 147 | | | | 140 | | | | 1,169 | | | Consumer | | | 151 | | | | (344 | ) | | | 30 | | | | 314 | | | | 151 | | | Allocation for general risk | | | 904 | | | | — | | | | — | | | | 83 | | | | 987 | | | Total | | $ | 9,921 | | | $ | (4,296 | ) | | $ | 357 | | | $ | 3,950 | | | $ | 9,932 | | | | | BALANCE AT
DECEMBER 31,
2014 | | CHARGE-
OFFS | | RECOVERIES | | PROVISION
(CREDIT) | | BALANCE AT
DECEMBER 31,
2015 | | Commercial | | $ | 3,262 | | | $ | (170 | ) | | $ | 101 | | | $ | 1,051 | | | $ | 4,244 | | | Commercial loans secured by real estate | | | 3,902 | | | | (250 | ) | | | 111 | | | | (314 | ) | | | 3,449 | | | Real estate-mortgage | | | 1,310 | | | | (753 | ) | | | 171 | | | | 445 | | | | 1,173 | | | Consumer | | | 190 | | | | (188 | ) | | | 26 | | | | 123 | | | | 151 | | | Allocation for general risk | | | 959 | | | | — | | | | — | | | | (55 | ) | | | 904 | | | Total | | $ | 9,623 | | | $ | (1,361 | ) | | $ | 409 | | | $ | 1,250 | | | $ | 9,921 | | | | | BALANCE AT
DECEMBER 31,
2013 | | CHARGE-
OFFS | | RECOVERIES | | PROVISION
(CREDIT) | | BALANCE AT
DECEMBER 31,
2014 | | Commercial | | $ | 2,844 | | | $ | (172 | ) | | $ | 141 | | | $ | 449 | | | $ | 3,262 | | | Commercial loans secured by real estate | | | 4,885 | | | | (708 | ) | | | 231 | | | | (506 | ) | | | 3,902 | | | Real estate-mortgage | | | 1,260 | | | | (322 | ) | | | 71 | | | | 301 | | | | 1,310 | | | Consumer | | | 136 | | | | (121 | ) | | | 24 | | | | 151 | | | | 190 | | | Allocation for general risk | | | 979 | | | | — | | | | — | | | | (20 | ) | | | 959 | | | Total | | $ | 10,104 | | | $ | (1,323 | ) | | $ | 467 | | | $ | 375 | | | $ | 9,623 | | |
Schedule of Primary Segments of Loan Portfolio [Table Text Block] | The following tables summarize the loan portfolio and allowance for loan loss by the primary segments of the loan portfolio. | | | AT DECEMBER 31, 2016 | | | | (IN THOUSANDS) | | Loans: | | COMMERCIAL | | COMMERCIAL
LOANS
SECURED BY
REAL ESTATE | | REAL ESTATE-
MORTGAGE | | CONSUMER | | TOTAL | | Individually evaluated for impairment | | $ | 496 | | | $ | 178 | | | $ | — | | | $ | — | | | $ | 674 | | | Collectively evaluated for impairment | | | 171,033 | | | | 446,420 | | | | 245,765 | | | | 19,872 | | | | 883,090 | | | Total loans | | $ | 171,529 | | | $ | 446,598 | | | $ | 245,765 | | | $ | 19,872 | | | $ | 883,764 | | | | | AT DECEMBER 31, 2016 | | | | (IN THOUSANDS) | | Allowance for loan losses: | | COMMERCIAL | | COMMERCIAL
LOANS
SECURED BY
REAL ESTATE | | REAL ESTATE-
MORTGAGE | | CONSUMER | | ALLOCATION
FOR ENERAL
RISK | | TOTAL | | Specific reserve allocation | | $ | 496 | | | $ | 31 | | | $ | — | | | $ | — | | | $ | — | | | $ | 527 | | | General reserve allocation | | | 3,545 | | | | 3,553 | | | | 1,169 | | | | 151 | | | | 987 | | | | 9,405 | | | Total allowance for loan losses | | $ | 4,041 | | | $ | 3,584 | | | $ | 1,169 | | | $ | 151 | | | $ | 987 | | | $ | 9,932 | | | | | AT DECEMBER 31, 2015 | | | | (IN THOUSANDS) | | Loans: | | COMMERCIAL | | COMMERCIAL
LOANS
SECURED BY
REAL ESTATE | | REAL ESTATE-
MORTGAGE | | CONSUMER | | TOTAL | | Individually evaluated for impairment | | $ | 4,416 | | | $ | 86 | | | $ | — | | | $ | — | | | $ | 4,502 | | | Collectively evaluated for impairment | | | 176,650 | | | | 421,551 | | | | 257,937 | | | | 20,344 | | | | 876,482 | | | Total loans | | $ | 181,066 | | | $ | 421,637 | | | $ | 257,937 | | | $ | 20,344 | | | $ | 880,984 | | | | | AT DECEMBER 31, 2015 | | | | (IN THOUSANDS) | | Allowance for loan losses: | | COMMERCIAL | | COMMERCIAL
LOANS
SECURED BY
REAL ESTATE | | REAL
ESTATE-
MORTGAGE | | CONSUMER | | ALLOCATION
FOR GENERAL
RISK | | TOTAL | | Specific reserve allocation | | $ | 1,387 | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | 1,387 | | | General reserve allocation | | | 2,857 | | | | 3,449 | | | | 1,173 | | | | 151 | | | | 904 | | | | 8,534 | | | Total allowance for loan losses | | $ | 4,244 | | | $ | 3,449 | | | $ | 1,173 | | | $ | 151 | | | $ | 904 | | | $ | 9,921 | | |
Impaired Financing Receivables [Table Text Block] | The following tables present impaired loans by class, segregated by those for which a specific allowance was required and those for which a specific allowance was not necessary. | | | AT DECEMBER 31, 2016 | | | | IMPAIRED LOANS WITH
SPECIFIC ALLOWANCE
| | IMPAIRED
LOANS WITH
NO SPECIFIC
ALLOWANCE | | TOTAL IMPAIRED LOANS | | | | RECORDED
INVESTMENT | | RELATED
ALLOWANCE | | RECORDED
INVESTMENT | | RECORDED
INVESTMENT | | UNPAID
PRINCIPAL
BALANCE | | | | (IN THOUSANDS) | | Commercial | | $ | 496 | | | $ | 496 | | | $ | — | | | $ | 496 | | | $ | 517 | | | Commercial loans secured by real estate | | | 162 | | | | 31 | | | | 16 | | | | 178 | | | | 209 | | | Total impaired loans | | $ | 658 | | | $ | 527 | | | $ | 16 | | | $ | 674 | | | $ | 726 | | | | | AT DECEMBER 31, 2015 | | | | IMPAIRED LOANS WITH
SPECIFIC ALLOWANCE | | IMPAIRED
LOANS WITH
NO SPECIFIC
ALLOWANCE | | TOTAL IMPAIRED LOANS | | | | RECORDED
INVESTMENT | | RELATED
ALLOWANCE | | RECORDED
INVESTMENT | | RECORDED
INVESTMENT | | UNPAID
PRINCIPAL
BALANCE | | | | (IN THOUSANDS) | | Commercial | | $ | 4,416 | | | $ | 1,387 | | | $ | — | | | $ | 4,416 | | | $ | 4,421 | | | Commercial loans secured by real estate | | | — | | | | — | | | | 86 | | | | 86 | | | | 522 | | | Total impaired loans | | $ | 4,416 | | | $ | 1,387 | | | $ | 86 | | | $ | 4,502 | | | $ | 4,943 | | |
Schedule of Average Recorded Investment in Impaired Loans and Related Interest Income Recognized [Table Text Block] | The following table presents the average recorded investment in impaired loans and related interest income recognized for the periods indicated. | | | YEAR ENDED DECEMBER 31, | | | | 2016 | | 2015 | | 2014 | | | | (IN THOUSANDS) | | Average impaired balance:
| | | | | | | | | | | | | | Commercial | | $ | 718 | | | $ | 1,271 | | | $ | — | | | Commercial loans secured by real estate | | | 356 | | | | 866 | | | | 1,756 | | | Consumer | | | — | | | | 9 | | | | — | | | Average investment in impaired loans | | $ | 1,074 | | | $ | 2,146 | | | $ | 1,756 | | | Interest income recognized:
| | | | | | | | | | | | | | Commercial | | $ | 14 | | | $ | 10 | | | $ | — | | | Commercial loans secured by real estate | | | 8 | | | | 17 | | | | 12 | | | Consumer | | | — | | | | — | | | | — | | | Interest income recognized on a cash basis on impaired loans | | $ | 22 | | | $ | 27 | | | $ | 12 | | |
Financing Receivable Credit Quality Indicators [Table Text Block] | The following table presents the classes of the loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system. | | | AT DECEMBER 31, 2016 | | | | PASS | | SPECIAL
MENTION | | SUBSTANDARD | | DOUBTFUL | | TOTAL | | | | (IN THOUSANDS) | | Commercial | | $ | 168,116 | | | $ | 1,087 | | | $ | 1,830 | | | $ | 496 | | | $ | 171,529 | | | Commercial loans secured by real estate | | | 436,318 | | | | 7,497 | | | | 2,767 | | | | 16 | | | | 446,598 | | | Total | | $ | 604,434 | | | $ | 8,584 | | | $ | 4,597 | | | $ | 512 | | | $ | 618,127 | | | | | AT DECEMBER 31, 2015 | | | | PASS | | SPECIAL MENTION | | SUBSTANDARD | | DOUBTFUL | | TOTAL | | | | (IN THOUSANDS) | | Commercial | | $ | 174,616 | | | $ | 1,811 | | | $ | 3,318 | | | $ | 1,321 | | | $ | 181,066 | | | Commercial loans secured by real estate | | | 416,331 | | | | 3,100 | | | | 2,188 | | | | 18 | | | | 421,637 | | | Total | | $ | 590,947 | | | $ | 4,911 | | | $ | 5,506 | | | $ | 1,339 | | | $ | 602,703 | | |
Schedule of Financing Receivable Performing and Nonperforming [Table Text Block] | The following tables present the performing and non-performing outstanding balances of the residential and consumer portfolios. | | | AT DECEMBER 31, 2016 | | | | PERFORMING | | NON-
PERFORMING | | | | (IN THOUSANDS) | | Real estate-mortgage | | $ | 244,836 | | | $ | 929 | | | Consumer | | | 19,872 | | | | — | | | Total | | $ | 264,708 | | | $ | 929 | | | | | AT DECEMBER 31, 2015 | | | | PERFORMING | | NON-
PERFORMING | | | | (IN THOUSANDS) | | Real estate-mortgage | | $ | 256,149 | | | $ | 1,788 | | | Consumer | | | 20,344 | | | | — | | | Total | | $ | 276,493 | | | $ | 1,788 | | |
Past Due Financing Receivables [Table Text Block] | The following tables present the classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans. | | | AT DECEMBER 31, 2016 | | | | CURRENT | | 30 – 59
DAYS PAST
DUE | | 60 – 89
DAYS PAST
DUE | | 90 DAYS
PAST DUE | | TOTAL
PAST DUE | | TOTAL
LOANS | | 90 DAYS
PAST DUE
AND STILL
ACCRUING | | | | (IN THOUSANDS) | | Commercial | | $ | 171,292 | | | $ | 237 | | | $ | — | | | $ | — | | | $ | 237 | | | $ | 171,529 | | | $ | — | | | Commercial loans secured by real estate | | | 446,477 | | | | 121 | | | | — | | | | — | | | | 121 | | | | 446,598 | | | | — | | | Real estate-mortgage | | | 241,802 | | | | 2,856 | | | | 610 | | | | 497 | | | | 3,963 | | | | 245,765 | | | | — | | | Consumer | | | 19,795 | | | | 50 | | | | 27 | | | | — | | | | 77 | | | | 19,872 | | | | — | | | Total | | $ | 879,366 | | | $ | 3,264 | | | $ | 637 | | | $ | 497 | | | $ | 4,398 | | | $ | 883,764 | | | $ | — | | | | | AT DECEMBER 31, 2015 | | | | CURRENT | | 30 – 59
DAYS PAST
DUE | | 60 – 89
DAYS PAST
DUE | | 90 DAYS
PAST DUE | | TOTAL
PAST DUE | | TOTAL
LOANS | | 90 DAYS
PAST DUE
AND STILL
ACCRUING | | | | (IN THOUSANDS) | | Commercial | | $ | 176,216 | | | $ | 489 | | | $ | 4,361 | | | $ | — | | | $ | 4,850 | | | $ | 181,066 | | | $ | — | | | Commercial loans secured by real estate | | | 421,247 | | | | 208 | | | | 182 | | | | — | | | | 390 | | | | 421,637 | | | | — | | | Real estate-mortgage | | | 254,288 | | | | 2,658 | | | | 442 | | | | 549 | | | | 3,649 | | | | 257,937 | | | | — | | | Consumer | | | 20,115 | | | | 67 | | | | 162 | | | | — | | | | 229 | | | | 20,344 | | | | — | | | Total | | $ | 871,866 | | | $ | 3,422 | | | $ | 5,147 | | | $ | 549 | | | $ | 9,118 | | | $ | 880,984 | | | $ | — | | |