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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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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