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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | $ 365,613 | $ 281,606
Unrealized Gains | 11,739 | 5,590
Unrealized Losses | (218) | (151)
Fair Value (Estimated) | 377,134 | 287,045
Restricted equity securities |  |
Federal Home Loan Bank Stock | 9,508 | 7,945
Federal Reserve Bank Stock | 1,037 | 1,037
Restricted equity securities | 10,545 | 8,982
U.S. government-sponsored agencies |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 44,149 | 32,840
Unrealized Gains | 143 | 47
Unrealized Losses | (18) | (26)
Fair Value (Estimated) | 44,274 | 32,861
Mortgage-backed securities |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 53,594 | 14,431
Unrealized Gains | 736 | 450
Unrealized Losses | (195) | (16)
Fair Value (Estimated) | 54,135 | 14,865
State and political subdivisions |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 245,620 | 219,585
Unrealized Gains | 10,427 | 4,936
Unrealized Losses | (3) | (109)
Fair Value (Estimated) | 256,044 | 224,412
Corporate securities |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 22,250 | 14,750
Unrealized Gains | 433 | 157
Unrealized Losses | (2) | 0
Fair Value (Estimated) | $ 22,681 | $ 14,907

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