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Investment Securities Investment Securities, Part III (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 128,892
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	78,637
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	74,167
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	1,220
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	282,916
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	674,223
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	391,307
Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]
AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value	129,656
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value	80,882
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value	77,953
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value	1,431
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	289,922
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	396,126
Fair Value	686,048	$ 692,274
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	64,511
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	5,031
Held-to-maturity, at amortized cost (estimated fair value of $69,572 and $67,909 at December 31, 2019 and 2018, respectively)	69,542	69,436
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	64,501
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	5,071
Debt Securities, Held-to-maturity, Fair Value	$ 69,572	$ 67,909

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Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]

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