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198 - Disclosure - Reconciliation of Activity for Assets Measured at Fair Value based on Significant Unobservable (Non-market) Information (Detail)
(http://www.thefirstbank.com/role/ReconciliationOfActivityForAssetsMeasuredAtFairValueBasedOnSignificantUnobservableNonmarketInformationDetail)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000947559 (http://www.sec.gov/CIK)
Legal Entity [Axis]Entity [Domain]
Investment Type [Axis]Bank-Issued Trust Preferred Securities
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Balance of recurring Level 3 assets at January 1
2,557,000  
2,801,000  
2,798,000  
Transfers into Level 3
0  
0  
0  
Transfers out of Level 3
0  
0  
0  
Unrealized income (loss) included in comprehensive income
(316,000) 
(244,000) 
3,000  
Balance of recurring Level 3 assets at December 31
2,241,000  
 
2,557,000  
 
2,801,000