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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 376,181	$ 365,613	$ 341,962
Unrealized Gains	9,777	11,739	10,347
Unrealized Losses	(2,504)	(218)	(84)
Fair Value (Estimated)	383,454	377,134	352,225
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	31,144
Unrealized Gains	45	143	177
Unrealized Losses	(897)	(18)	0
Fair Value (Estimated)	34,748	44,274	31,321
Mortgage-backed securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	69,086	53,594	50,983
Unrealized Gains	406	736	1,089
Unrealized Losses	(1,424)	(195)	(52)
Fair Value (Estimated)	68,068	54,135	52,020
State and political subdivisions
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	253,245	245,620	245,085
Unrealized Gains	8,829	10,427	8,492
Unrealized Losses	(161)	(3)	(32)
Fair Value (Estimated)	261,913	256,044	253,545
Corporate securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	18,250	22,250	14,750
Unrealized Gains	497	433	589
Unrealized Losses	(22)	(2)	0
Fair Value (Estimated)	$ 18,725	$ 22,681	$ 15,339

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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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