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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, 2022	Dec. 31, 2021
Securities to be held to maturity
Amortized Cost	$ 393,896	$ 370,040
Unrealized Gains	200	8,599
Unrealized Losses	(55,085)	(3,312)
Fair Value (Estimated)	339,011	375,327
Restricted equity securities
Federal Home Loan Bank Stock	2,846	4,328
Federal Reserve Bank Stock	1,037	1,037
Restricted equity securities	3,883	5,365
U.S. Government-sponsored agencies
Securities to be held to maturity
Amortized Cost	40,100	35,600
Unrealized Gains	4	2
Unrealized Losses	(10,477)	(1,149)
Fair Value (Estimated)	29,627	34,453
Mortgage-backed securities
Securities to be held to maturity
Amortized Cost	60,497	60,646
Unrealized Gains	42	261
Unrealized Losses	(11,392)	(1,795)
Fair Value (Estimated)	49,147	59,112
State and political subdivisions
Securities to be held to maturity
Amortized Cost	258,549	250,544
Unrealized Gains	154	7,925
Unrealized Losses	(30,733)	(302)
Fair Value (Estimated)	227,970	258,167
Corporate securities
Securities to be held to maturity
Amortized Cost	34,750	23,250
Unrealized Gains	0	411
Unrealized Losses	(2,483)	(66)
Fair Value (Estimated)	$ 32,267	$ 23,595

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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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