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Investments in Securities - Investment in Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Available-for-sale Securities |  |
Available-for-sale Securities, Amortized Cost Amount | $ 489,198 | $ 384,807
Available-for-sale Securities, Gross Unrealized Gain | 15,119 | 31,338
Available-for-sale Securities, Gross Unrealized Loss | 3,285 | 1,212
Available-for-sale Securities, Fair Value | 501,032 | 414,933
Agency mortgage-backed securities. |  |
Available-for-sale Securities, Amortized Cost Amount | 219,624 | 151,106
Available-for-sale Securities, Gross Unrealized Gain | 10,561 | 19,665
Available-for-sale Securities, Gross Unrealized Loss | 744 | 831
Available-for-sale Securities, Fair Value | 229,441 | 169,940
Agency collateralized mortgage obligations |  |
Available-for-sale Securities, Amortized Cost Amount | 204,332 | 168,472
Available-for-sale Securities, Gross Unrealized Gain | 2,443 | 8,524
Available-for-sale Securities, Gross Unrealized Loss | 2,498 | 375
Available-for-sale Securities, Fair Value | 204,277 | 176,621
States and political subdivisions securities |  |
Available-for-sale Securities, Amortized Cost Amount | 38,440 | 45,196
Available-for-sale Securities, Gross Unrealized Gain | 1,618 | 2,135
Available-for-sale Securities, Gross Unrealized Loss | 43 | 6
Available-for-sale Securities, Fair Value | 40,015 | 47,325
Small Business Administration securities |  |
Available-for-sale Securities, Amortized Cost Amount | 26,802 | 20,033
Available-for-sale Securities, Gross Unrealized Gain | 497 | 1,014
Available-for-sale Securities, Fair Value | $ 27,299 | $ 21,047

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