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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ 115,134 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 108,899 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 148,294 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 3,366 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | 375,693 |
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 479,470 |
Amortized Cost | 855,163 | $ 673,946
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 | 0 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 5,016 |
Held-to-maturity | 5,016 | 69,542
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 | 115,019 |
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value | 113,091 |
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value | 156,053 |
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value | 3,729 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 387,892 |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 491,348 |
Fair Value | 879,240 |
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 | 0 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 5,119 |
Debt Securities, Held-to-maturity, Fair Value | $ 5,119 | $ 69,572

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