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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | $ 375,699 | $ 365,613 | $ 331,962
Unrealized Gains | 8,037 | 11,739 | 10,288
Unrealized Losses | (3,939) | (218) | (188)
Fair Value (Estimated) | 379,797 | 377,134 | 342,062
Equity Securities, Restricted [Abstract] |  |  |
Federal Home Loan Bank Stock | 7,802 | 9,508 | 9,508
Federal Reserve Bank Stock | 1,037 | 1,037 | 1,037
Restricted equity securities | 8,839 | 10,545 | 10,545
U.S. Government-sponsored agencies |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 35,600 | 44,149 | 26,146
Unrealized Gains | 17 | 143 | 294
Unrealized Losses | (1,161) | (18) | 0
Fair Value (Estimated) | 34,456 | 44,274 | 26,440
Mortgage-backed securities |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 64,651 | 53,594 | 43,414
Unrealized Gains | 354 | 736 | 844
Unrealized Losses | (1,701) | (195) | (119)
Fair Value (Estimated) | 63,304 | 54,135 | 44,139
State and political subdivisions |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 254,198 | 245,620 | 245,152
Unrealized Gains | 7,251 | 10,427 | 8,660
Unrealized Losses | (1,042) | (3) | (69)
Fair Value (Estimated) | 260,407 | 256,044 | 253,743
Corporate securities |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 21,250 | 22,250 | 17,250
Unrealized Gains | 415 | 433 | 490
Unrealized Losses | (35) | (2) | 0
Fair Value (Estimated) | $ 21,630 | $ 22,681 | $ 17,740

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