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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

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