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Investments - Estimated Fair Value of Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Maturing within one year, Amortized Cost | $ 7,037 | $ 7,155
Maturing after one year through five years, Amortized Cost | 15,424 | 17,008
Maturing after five years through ten years, Amortized Cost | 35,850 | 33,805
Maturing after ten years, Amortized Cost | 148,842 | 136,057
Investment securities not due at a single maturity date, Amortized Cost | 194,774 |
Amortized Cost | 600,832 | 592,378
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Maturing within one year, Fair Value | 7,158 | 7,244
Maturing after one year through five years, Fair Value | 15,631 | 17,171
Maturing after five years through ten years, Fair Value | 36,927 | 34,881
Maturing after ten years, Fair Value | 155,192 | 141,114
Fair Value, Total | 620,154 | 600,799
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Amortized Cost | 195,565 | 181,900
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Fair Value, Total | 203,166 | 188,265
Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Investment securities not due at a single maturity date, Amortized Cost |  | 189,554
Amortized Cost | 393,680 | 398,353
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Investment securities not due at a single maturity date, Fair Value | 199,613 | 190,488
Fair Value, Total | 405,246 | 400,389
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Investment securities not due at a single maturity date, Amortized Cost | 198,905 | 208,799
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Investment securities not due at a single maturity date, Fair Value | $ 205,633 | $ 209,901

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