Securities (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2026 USD ($) security	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) security
Securities available for sale
Percent	100.00%		100.00%
Amount	$ 958,384		$ 955,584
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	969,159		957,295
Gross Unrealized Gains	4,052		8,788
Gross Unrealized (Losses)	(14,827)		(10,499)
Allowance for Credit Losses	0		0
Amortized Cost
Due in one year or less	77,313
Due after one year through five years	280,659
Due after five years through ten years	86,872
Due over ten years	207,056
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	651,900
Fair Value
Due in one year or less	76,632
Due after one year through five years	280,312
Due after five years through ten years	79,591
Due over ten years	204,513
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	641,048
Carrying value of investment securities pledged to collateralize short-term borrowings	958,384		955,584
Sales Proceeds and Gross Realized Gains and Losses
Sale proceeds	134	$ 0
Gross realized gains	0	0
Gross realized losses	$ (13)	$ 0	$ 9,630
Less than 12 months
Number of securities \| security	445		92
Fair Value	$ 365,993		$ 159,845
Unrealized Loss	$ (4,665)		$ (926)
Percentage	1.27%		0.58%
12 months or more
Number of securities \| security	369		545
Fair Value	$ 165,550		$ 240,681
Unrealized Loss	$ (10,162)		$ (9,573)
Percentage	6.14%		3.98%
Total
Number of securities \| security	814		637
Fair Value	$ 531,543		$ 400,526
Unrealized Loss	$ (14,827)		$ (10,499)
Percentage	2.79%		2.62%
Collateralized Securities
Securities available for sale
Amount	$ 153,290		$ 154,030
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 153,290		$ 154,030
U.S. Treasury
Securities available for sale
Percent	27.59%		26.74%
Amount	$ 264,428		$ 255,527
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	264,404		253,925
Gross Unrealized Gains	1,081		2,316
Gross Unrealized (Losses)	(1,057)		(714)
Allowance for Credit Losses	0		0
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 264,428		$ 255,527
Less than 12 months
Number of securities \| security	18		6
Fair Value	$ 76,527		$ 29,972
Unrealized Loss	$ (525)		$ (69)
Percentage	0.69%		0.23%
12 months or more
Number of securities \| security	19		23
Fair Value	$ 51,814		$ 61,637
Unrealized Loss	$ (532)		$ (645)
Percentage	1.03%		1.05%
Total
Number of securities \| security	37		29
Fair Value	$ 128,341		$ 91,609
Unrealized Loss	$ (1,057)		$ (714)
Percentage	0.82%		0.78%
U.S. Government Agency and GSE securities
Securities available for sale
Percent	0.48%		0.49%
Amount	$ 4,592		$ 4,658
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	4,711		4,687
Gross Unrealized Gains	0		0
Gross Unrealized (Losses)	(119)		(29)
Allowance for Credit Losses	0		0
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 4,592		$ 4,658
Less than 12 months
Number of securities \| security	1		1
Fair Value	$ 4,592		$ 4,658
Unrealized Loss	$ (119)		$ (29)
Percentage	2.59%		0.62%
12 months or more
Number of securities \| security	0		0
Fair Value	$ 0		$ 0
Unrealized Loss	$ 0		$ 0
Percentage	0.00%		0.00%
Total
Number of securities \| security	1		1
Fair Value	$ 4,592		$ 4,658
Unrealized Loss	$ (119)		$ (29)
Percentage	2.59%		0.62%
State and political subdivisions
Securities available for sale
Percent	38.82%		40.04%
Amount	$ 372,028		$ 382,645
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	382,785		388,685
Gross Unrealized Gains	1,402		3,214
Gross Unrealized (Losses)	(12,159)		(9,254)
Allowance for Credit Losses	0		0
Fair Value
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 372,028		$ 382,645
Less than 12 months
Number of securities \| security	413		78
Fair Value	$ 173,209		$ 47,697
Unrealized Loss	$ (2,793)		$ (446)
Percentage	1.61%		0.94%
12 months or more
Number of securities \| security	346		518
Fair Value	$ 95,158		$ 159,124
Unrealized Loss	$ (9,366)		$ (8,808)
Percentage	9.84%		5.54%
Total
Number of securities \| security	759		596
Fair Value	$ 268,367		$ 206,821
Unrealized Loss	$ (12,159)		$ (9,254)
Percentage	4.53%		4.47%
Mortgage-backed securities and collateralized mortgage obligations
Securities available for sale
Percent	33.11%		32.73%
Amount	$ 317,336		$ 312,754
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	317,259		309,998
Gross Unrealized Gains	1,569		3,258
Gross Unrealized (Losses)	(1,492)		(502)
Allowance for Credit Losses	0		0
Amortized Cost
Mortgage-backed securities and collateralized mortgage obligations	317,259
Fair Value
Mortgage-backed securities and collateralized mortgage obligations	317,336
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 317,336		$ 312,754
Less than 12 months
Number of securities \| security	13		7
Fair Value	$ 111,665		$ 77,518
Unrealized Loss	$ (1,228)		$ (382)
Percentage	1.10%		0.49%
12 months or more
Number of securities \| security	4		4
Fair Value	$ 18,578		$ 19,920
Unrealized Loss	$ (264)		$ (120)
Percentage	1.42%		0.60%
Total
Number of securities \| security	17		11
Fair Value	$ 130,243		$ 97,438
Unrealized Loss	$ (1,492)		$ (502)
Percentage	1.15%		0.52%

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