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Off-Balance Sheet Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 235,302 $ 236,471
Commitments related to secondary market mortgage loans   1,391
Standby letters of credit and financial guarantees 7,765 3,581
Total off-balance sheet risk 243,067 241,443
Reserve for unfunded commitments $ 326 $ 326