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Fair Value of Financial Instruments - Balances of Impaired Loans and OREO Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Impaired Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 4,243 $ 1,456
Impaired Loans [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 4,243 1,456
OREO [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 6,656 7,735
OREO [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 6,656 $ 7,735