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Borrowed Funds - Schedule of Short-Term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total short-term borrowings $ 146,781us-gaap_ShortTermBorrowings $ 281,455us-gaap_ShortTermBorrowings
Short-term borrowings [Member]    
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase 146,781us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_DebtInstrumentAxis
= us-gaap_ShortTermDebtMember
231,455us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_DebtInstrumentAxis
= us-gaap_ShortTermDebtMember
Federal funds purchased 0us-gaap_FederalFundsPurchased
/ us-gaap_DebtInstrumentAxis
= us-gaap_ShortTermDebtMember
50,000us-gaap_FederalFundsPurchased
/ us-gaap_DebtInstrumentAxis
= us-gaap_ShortTermDebtMember
Total short-term borrowings $ 146,781us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_ShortTermDebtMember
$ 281,455us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_ShortTermDebtMember