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Commitments and Contingencies (Off-Balance Sheet Commitments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Commitments To Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 503,349us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
$ 450,343us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby Letters Of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 10,665us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
$ 8,578us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember