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Investment Securities (Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments [Abstract]
Debt securities available for sale, Due in one year or less, Amortized Cost	$ 26,364
Debt securities available for sale, Due from one to five years, Amortized Cost	144,174
Debt securities available for sale, Due after five years through ten years, Amortized Cost	238,443
Debt securities available for sale, Due after ten years, Amortized Cost	98,618
Debt securities available for sale, Amortized Cost	507,599
Debt securities available for sale, Due in one year or less, Fair Value	26,197
Debt securities available for sale, Due from one to five years, Fair Value	140,856
Debt securities available for sale, Due after five years through ten years, Fair Value	229,545
Debt securities available for sale, Due after ten years, Fair Value	95,630
Debt securities available for sale, Fair Value	492,228
Debt securities held to maturity, Due in one year or less, Amortized Cost	55,989
Debt securities held to maturity, Due from one to five years, Amortized Cost	151,052
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	88,698
Debt securities held to maturity, Due after ten years, Amortized Cost	179,064
Securities held to maturity, Amortized Cost	474,803	$ 516,466
Debt securities held to maturity, Due in one year or less, Fair Value	56,177
Debt securities held to maturity, Due from one to five years, Fair Value	151,799
Debt securities held to maturity, Due after five years through ten years, Fair Value	85,681
Debt securities held to maturity, Due after ten years, Fair Value	171,885
Securities held to maturity, Fair Value	$ 465,542	$ 512,983

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