Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities to be held to maturity
Amortized Cost	$ 370,040	$ 365,613
Unrealized Gains	8,599	11,739
Unrealized Losses	(3,312)	(218)
Fair Value (Estimated)	375,327	377,134
Restricted equity securities
Federal Home Loan Bank Stock	4,328	9,508
Federal Reserve Bank Stock	1,037	1,037
Restricted equity securities	5,365	10,545
U.S. Government-sponsored agencies
Securities to be held to maturity
Amortized Cost	35,600	44,149
Unrealized Gains	2	143
Unrealized Losses	(1,149)	(18)
Fair Value (Estimated)	34,453	44,274
Mortgage-backed securities
Securities to be held to maturity
Amortized Cost	60,646	53,594
Unrealized Gains	261	736
Unrealized Losses	(1,795)	(195)
Fair Value (Estimated)	59,112	54,135
State and political subdivisions
Securities to be held to maturity
Amortized Cost	250,544	245,620
Unrealized Gains	7,925	10,427
Unrealized Losses	(302)	(3)
Fair Value (Estimated)	258,167	256,044
Corporate securities
Securities to be held to maturity
Amortized Cost	23,250	22,250
Unrealized Gains	411	433
Unrealized Losses	(66)	(2)
Fair Value (Estimated)	$ 23,595	$ 22,681

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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