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Commitments, Contingencies and Off-Balance-Sheet Risk - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate $ 6,039 $ 9,609
Variable Rate 222,866 183,847
Lines of Credit and Construction Loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 5,835 9,405
Variable Rate 196,931 160,718
Overdraft Protection [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 4 4
Variable Rate 25,208 22,122
Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 200 200
Variable Rate $ 727 $ 1,007