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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
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Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Amortized Cost | $ 66 | $ 127 | $ 0
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 25,221 | 36,534 | 15,670
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 62,462 | 93,134 | 107,978
Due after 10 years, Securities available for sale, Amortized Cost | 215,192 | 226,095 | 203,576
Amortized Cost | 302,941 | 355,890 | 327,224
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) | 66 | 127 | 0
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 26,159 | 36,778 | 15,736
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 65,032 | 95,014 | 108,698
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 221,671 | 228,601 | 200,842
Securities available for sale, Fair Value (Estimated) | 312,928 | 360,520 | 325,276
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Amortized Cost | 1,331 | 1,334 | 1,429
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 27,854 | 25,860 | 21,096
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 184,037 | 179,133 | 176,967
Due after 10 years, Securities to be held to maturity, Amortized Cost | 128,370 | 75,279 | 81,727
Securities to be held to maturity, Amortized Cost | 341,592 | 281,606 | 281,219
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) | 1,337 | 1,338 | 1,431
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 28,361 | 26,323 | 21,203
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 189,214 | 182,834 | 178,044
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 130,336 | 76,550 | 81,890
Securities to be held to maturity, Fair Value (Estimated) | $ 349,248 | $ 287,045 | $ 282,568

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