Investment Securities - Schedule of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Securities to be held to maturity
Amortized Cost	$ 356,074,000	$ 369,900,000
Unrealized Gains	329,000	98,000
Unrealized Losses	(40,921,000)	(55,005,000)
Fair Value (Estimated)	315,482,000	314,993,000
Less allowance for credit losses	(146,000)	(196,000)	$ (434,000)
Net securities to be held to maturity	355,928,000	369,704,000
Restricted equity securities
Federal Home Loan Bank Stock	7,238,000	6,166,000
Federal Reserve Bank Stock	1,037,000	1,037,000
Restricted equity securities	8,275,000	7,203,000
U.S. Treasury & Agency securities
Securities to be held to maturity
Amortized Cost	38,100,000	38,100,000
Unrealized Gains	0	0
Unrealized Losses	(8,221,000)	(9,938,000)
Fair Value (Estimated)	29,879,000	28,162,000
Less allowance for credit losses	0
Mortgage-backed securities
Securities to be held to maturity
Amortized Cost	48,566,000	52,370,000
Unrealized Gains	116,000	15,000
Unrealized Losses	(8,924,000)	(11,360,000)
Fair Value (Estimated)	39,758,000	41,025,000
State and political subdivisions
Securities to be held to maturity
Amortized Cost	248,408,000	252,180,000
Unrealized Gains	161,000	83,000
Unrealized Losses	(22,972,000)	(31,739,000)
Fair Value (Estimated)	225,597,000	220,524,000
Less allowance for credit losses	(68,000)	(80,000)	(212,000)
Corporate securities
Securities to be held to maturity
Amortized Cost	21,000,000	27,250,000
Unrealized Gains	52,000	0
Unrealized Losses	(804,000)	(1,968,000)
Fair Value (Estimated)	20,248,000	25,282,000
Less allowance for credit losses	$ (78,000)	$ (116,000)	$ (222,000)