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Investment Securities (Scheduled Maturities of Securities Available for Sale and Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments [Abstract]
Debt securities available for sale, Due from one to five years, Amortized Cost	$ 49,466
Debt securities available for sale, Due after five years through ten years, Amortized Cost	160,496
Debt securities available for sale, Due after ten years, Amortized Cost	216,588
Securities available for sale, Amortized Cost	426,550	$ 415,852
Debt securities available for sale, Due from one to five years, Fair Value	51,454
Debt securities available for sale, Due after five years through ten years, Fair Value	170,193
Debt securities available for sale, Due after ten years, Fair Value	223,198
Debt securities available for sale, Fair Value	444,845	417,917
Debt securities held to maturity, Due in one year or less, Amortized Cost	54,240
Debt securities held to maturity, Due from one to five years, Amortized Cost	121,443
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	32,208
Debt securities held to maturity, Due after ten years, Amortized Cost	138,361
Securities held to maturity, Amortized Cost	346,252	359,000
Debt securities held to maturity, Due in one year or less, Fair Value	54,455
Debt securities held to maturity, Due from one to five years, Fair Value	123,697
Debt securities held to maturity, Due after five years through ten years, Fair Value	33,278
Debt securities held to maturity, Due after ten years, Fair Value	143,141
Securities held to maturity, Fair Value	$ 354,571	$ 363,259

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