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Investment Securities (Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investment Securities [Abstract]    
Debt securities available for sale, Due in one year or less, Amortized Cost $ 21us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Debt securities available for sale, Due from one to five years, Amortized Cost 153,578us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Debt securities available for sale, Due after five years through ten years, Amortized Cost 244,623us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Debt securities available for sale, Due after ten years, Amortized Cost 232,518us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Debt securities available for sale, Amortized Cost 630,740us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost  
Debt securities available for sale, Due in one year or less, Fair Value 22us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Debt securities available for sale, Due from one to five years, Fair Value 154,145us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Debt securities available for sale, Due after five years through ten years, Fair Value 250,793us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Debt securities available for sale, Due after ten years, Fair Value 234,315us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Debt securities available for sale, Fair Value 639,275us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Debt securities held to maturity, Due in one year or less, Amortized Cost 23,341us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Debt securities held to maturity, Due from one to five years, Amortized Cost 139,825us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Debt securities held to maturity, Due after five years through ten years, Amortized Cost 123,914us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Debt securities held to maturity, Due after ten years, Amortized Cost 19,175us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Held-to-maturity Securities, Total 306,255us-gaap_HeldToMaturitySecurities 294,438us-gaap_HeldToMaturitySecurities
Debt securities held to maturity, Due in one year or less, Fair Value 23,408us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Debt securities held to maturity, Due from one to five years, Fair Value 142,298us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Debt securities held to maturity, Due after five years through ten years, Fair Value 127,467us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Debt securities held to maturity, Due after ten years, Fair Value 19,337us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Securities held to maturity, Fair Value $ 312,510us-gaap_HeldToMaturitySecuritiesFairValue $ 298,695us-gaap_HeldToMaturitySecuritiesFairValue