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Investment Securities Investment Securities, Part III (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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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