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Long-Term Debt - Additional Information (Detail) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
FHLB advances outstanding $ 0 $ 5,000,000
Assets pledged associated with FHLB advances   5,700,000
Available credit from the FHLB $ 164,500,000 $ 166,800,000