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Short-term Borrowings (Short-term Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Short-term borrowings $ 330,264us-gaap_ShortTermBorrowings $ 408,756us-gaap_ShortTermBorrowings
Securities Sold Under Agreements to Repurchase    
Short-term Debt [Line Items]    
Short-term borrowings 240,214us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		 234,659us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Federal Funds Purchased    
Short-term Debt [Line Items]    
Short-term borrowings 14,050us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember		 69,097us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
FHLB Advance    
Short-term Debt [Line Items]    
Short-term borrowings $ 76,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 $ 105,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember