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Off-Balance Sheet Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 203,658 $ 236,471
Commitments related to secondary market mortgage loans 4,925 1,391
Standby letters of credit and financial guarantees 7,400 3,581
Total off-balance sheet risk 215,983 241,443
Reserve for unfunded commitments $ 326 $ 326