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Commitments, Contingencies and Off-Balance Sheet Risk - Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate $ 8,215 $ 9,621
Variable Rate 222,247 218,604
Lines of Credit and Construction Loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 7,610 9,416
Variable Rate 194,874 195,732
Overdraft Protection [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 5 5
Variable Rate 27,053 22,122
Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 600 200
Variable Rate $ 320 $ 750