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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, 2022	Dec. 31, 2021	Jun. 30, 2021
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 379,693	$ 370,040	$ 376,181
Unrealized Gains	410	8,599	9,777
Unrealized Losses	(44,153)	(3,312)	(2,504)
Fair Value (Estimated)	335,950	375,327	383,454
Equity Securities, Restricted [Abstract]
Federal Home Loan Bank Stock	3,683	4,328	7,802
Federal Reserve Bank Stock	1,037	1,037	1,037
Restricted equity securities	4,720	5,365	8,839
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	45
Unrealized Losses	(7,390)	(1,149)	(897)
Fair Value (Estimated)	30,710	34,453	34,748
Mortgage-backed securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	57,739	60,646	69,086
Unrealized Gains	107	261	406
Unrealized Losses	(8,403)	(1,795)	(1,424)
Fair Value (Estimated)	49,443	59,112	68,068
State and political subdivisions
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	256,104	250,544	253,245
Unrealized Gains	303	7,925	8,829
Unrealized Losses	(27,816)	(302)	(161)
Fair Value (Estimated)	228,591	258,167	261,913
Corporate securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	27,750	23,250	18,250
Unrealized Gains	0	411	497
Unrealized Losses	(544)	(66)	(22)
Fair Value (Estimated)	$ 27,206	$ 23,595	$ 18,725

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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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