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Restrictions on Cash and Due From Banks - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents [Abstract]      
Deposit liabilities reserves average $ 4,985,000us-gaap_RestrictedCashAndCashEquivalents $ 5,387,000us-gaap_RestrictedCashAndCashEquivalents $ 4,713,000us-gaap_RestrictedCashAndCashEquivalents