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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Investments in Affordable Housing Projects [Abstract]          
Investment for qualified affordable housing projects included in other assets $ 2,501,000   $ 2,501,000   $ 2,177,000
Unfunded commitments related to the investments in qualified affordable housing projects 1,716,000   1,716,000   $ 2,195,000
Recognized amortization expense included in pretax income 77,000 $ 70,000 154,000 $ 139,000  
Recognized tax credits and other benefits from its investment in affordable housing tax credits 148,000 116,000 295,000 233,000  
Impairment losses related to its investment in qualified affordable housing projects $ 0 $ 0 $ 0 $ 0