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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 377,183	$ 370,040	$ 385,352
Unrealized Gains	1,678	8,599	8,317
Unrealized Losses	(25,670)	(3,312)	(4,833)
Fair Value (Estimated)	353,191	375,327	388,836
Equity Securities, Restricted [Abstract]
Federal Home Loan Bank Stock	4,365	4,328	9,068
Federal Reserve Bank Stock	1,037	1,037	1,037
Restricted equity securities	5,402	5,365	10,105
U.S. Government-sponsored agencies
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	38,100	35,600	35,600
Unrealized Gains	0	2	55
Unrealized Losses	(4,845)	(1,149)	(2,041)
Fair Value (Estimated)	33,255	34,453	33,614
Mortgage-backed securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	59,648	60,646	76,365
Unrealized Gains	151	261	480
Unrealized Losses	(5,469)	(1,795)	(2,181)
Fair Value (Estimated)	54,330	59,112	74,664
State and political subdivisions
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	252,185	250,544	251,137
Unrealized Gains	1,430	7,925	7,435
Unrealized Losses	(15,007)	(302)	(525)
Fair Value (Estimated)	238,608	258,167	258,047
Corporate securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	27,250	23,250	22,250
Unrealized Gains	97	411	347
Unrealized Losses	(349)	(66)	(86)
Fair Value (Estimated)	$ 26,998	$ 23,595	$ 22,511

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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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