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Loan Commitments and Standby Letters of Credit (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Guarantor Obligations [Line Items]    
Maximum exposure to credit loss for loan commitments $ 629,400,000us-gaap_GuaranteeObligationsMaximumExposure $ 637,100,000us-gaap_GuaranteeObligationsMaximumExposure
Standby Letters of Credit [Member]    
Guarantor Obligations [Line Items]    
Guarantor Obligations, Current Carrying Value 1,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialStandbyLetterOfCreditMember		 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
Maximum exposure to credit loss for loan commitments $ 34,700,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialStandbyLetterOfCreditMember		 $ 34,600,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialStandbyLetterOfCreditMember