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Long-Term Debt - Additional Information (Detail) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
FHLB advances outstanding to secure borrowings $ 5,000,000 $ 5,000,000
Assets pledged 5,800,000 5,100,000
Available credit from the FHLB $ 163,800,000 $ 165,900,000