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Federal Funds Purchased (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
Outstanding federal funds purchased balance $ 0us-gaap_FederalFundsPurchased $ 0us-gaap_FederalFundsPurchased
Federal home loan bank, advances, general debt obligations, disclosures, amount of available, unused funds 4,700,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds  
Federal Reserve Bank Advances [Member]    
Federal Funds Purchased [Line Items]    
Lines of credit 698,800,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_FederalReserveBankAdvancesMember
 
Federal Funds Purchased [Member]    
Federal Funds Purchased [Line Items]    
Lines of credit $ 455,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_FederalFundsPurchasedMember
 
Minimum [Member]    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 0.30%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 1.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_RangeAxis
= us-gaap_MaximumMember