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Investment Securities (Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments [Abstract]
Debt securities available for sale, Due in one year or less, Amortized Cost	$ 35,676
Debt securities available for sale, Due from one to five years, Amortized Cost	139,223
Debt securities available for sale, Due after five years through ten years, Amortized Cost	214,640
Debt securities available for sale, Due after ten years, Amortized Cost	86,579
Debt securities available for sale, Amortized Cost	476,118
Debt securities available for sale, Due in one year or less, Fair Value	35,471
Debt securities available for sale, Due from one to five years, Fair Value	135,043
Debt securities available for sale, Due after five years through ten years, Fair Value	204,681
Debt securities available for sale, Due after ten years, Fair Value	83,115
Debt securities available for sale, Fair Value	458,310
Debt securities held to maturity, Due in one year or less, Amortized Cost	49,829
Debt securities held to maturity, Due from one to five years, Amortized Cost	150,749
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	83,277
Debt securities held to maturity, Due after ten years, Amortized Cost	175,768
Securities held to maturity, Amortized Cost	459,623	$ 516,466
Debt securities held to maturity, Due in one year or less, Fair Value	49,878
Debt securities held to maturity, Due from one to five years, Fair Value	150,479
Debt securities held to maturity, Due after five years through ten years, Fair Value	79,898
Debt securities held to maturity, Due after ten years, Fair Value	167,463
Securities held to maturity, Fair Value	$ 447,718	$ 512,983

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