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Commitments and Unfunded Credits - Financial Instruments Representing Credit Risk (Detail) (First Bank [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Commitments to Extend Credit and Unfunded Commitments Under Lines of Credit [Member]
   
Other Commitments [Line Items]    
Contract amounts represent credit risk $ 59,115 $ 52,849
Stand-By Letters of Credit [Member]
   
Other Commitments [Line Items]    
Contract amounts represent credit risk $ 7,610 $ 8,306