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Off-Balance Sheet Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 261,801 $ 235,302
Standby letters of credit and financial guarantees 8,180 7,765
Total off-balance sheet risk 269,981 243,067
Reserve for unfunded commitments $ 326 $ 326