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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($)		Sep. 30, 2023		Dec. 31, 2022	Sep. 30, 2022
Securities to be held to maturity
Amortized Cost		$ 387,806,000		$ 393,896,000	$ 381,906,000
Unrealized Gains		20,000		200,000	86,000
Unrealized Losses		(75,962,000)		(55,085,000)	(68,196,000)
Fair Value (Estimated)		311,864,000		339,011,000	313,796,000
Less allowance for credit losses		(432,000)	[1]	0	0
Net securities to be held to maturity	[1]	387,374,000		393,896,000	381,906,000
Restricted equity securities
Federal Home Loan Bank Stock		2,823,000		2,846,000	3,477,000
Federal Reserve Bank Stock		1,037,000		1,037,000	1,037,000
Restricted equity securities		3,860,000		3,883,000	4,514,000
U.S. Treasury & Agency securities
Securities to be held to maturity
Amortized Cost		40,100,000		40,100,000	38,100,000
Unrealized Gains		0		4,000	0
Unrealized Losses		(11,996,000)		(10,477,000)	(10,428,000)
Fair Value (Estimated)		28,104,000		29,627,000	27,672,000
Less allowance for credit losses		0
Mortgage-backed securities
Securities to be held to maturity
Amortized Cost		57,224,000		60,497,000	56,423,000
Unrealized Gains		4,000		42,000	48,000
Unrealized Losses		(13,336,000)		(11,392,000)	(11,784,000)
Fair Value (Estimated)		43,892,000		49,147,000	44,687,000
State and political subdivisions
Securities to be held to maturity
Amortized Cost		255,732,000		258,549,000	257,633,000
Unrealized Gains		16,000		154,000	38,000
Unrealized Losses		(46,807,000)		(30,733,000)	(43,899,000)
Fair Value (Estimated)		208,941,000		227,970,000	213,772,000
Less allowance for credit losses		(212,000)		0
Corporate securities
Securities to be held to maturity
Amortized Cost		34,750,000		34,750,000	29,750,000
Unrealized Gains		0		0	0
Unrealized Losses		(3,823,000)		(2,483,000)	(2,085,000)
Fair Value (Estimated)		30,927,000		32,267,000	$ 27,665,000
Less allowance for credit losses		$ (220,000)		$ 0
[1] December 31, 2022 and September 30, 2022 had no allowance for credit losses

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