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Borrowings - Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances, variable and fixed rates ranging from 0.32% to 7.53%, due at various dates through November 15, 2024 $ 116,473us-gaap_AdvancesFromFederalHomeLoanBanks $ 75,050us-gaap_AdvancesFromFederalHomeLoanBanks
Securities sold under agreements to repurchase 139,725us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 140,246us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Federal funds purchased 95,000us-gaap_FederalFundsPurchased 41,000us-gaap_FederalFundsPurchased
Total borrowings $ 351,198us-gaap_LongTermDebt $ 256,296us-gaap_LongTermDebt