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1086 - Disclosure - Employee Benefit Plans - Components of Net Periodic Benefit Cost (Gain) (Detail)
(http://www.baybanks.com/taxonomy/role/DisclosureEmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostGain)
TableDefined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001034594 (http://www.sec.gov/CIK)
Legal EntityEntity [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Defined Benefit Plans and Other Postretirement Benefit PlansDefined Benefit Plans and Other Postretirement Benefit Plans
Pension Plan, Defined BenefitOther Postretirement Benefit Plan, Defined BenefitPension Plan, Defined BenefitOther Postretirement Benefit Plan, Defined Benefit
Service cost
 
22,000  
 
23,000  
Interest cost
134,000  
28,000  
131,000  
30,000  
Expected (return) on plan assets
(189,000) 
 
(196,000) 
 
Amortization of prior service cost
0  
0  
0  
0  
Amortization of net obligation at transition
0  
0  
0  
0  
Recognized net loss due to settlement
90,000  
   
Recognized net actuarial loss
77,000  
 
76,000  
 
Net periodic benefit (gain) cost
112,000  
 
50,000  
 
11,000  
 
53,000