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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
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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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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