Income Taxes, Major Reasons for the Difference in Effective Income Tax Rate from the Federal Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 10,105	$ (1,276)	$ (2,232)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	2.30%	10.40%	7.40%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.90%	(0.90%)	(1.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount	$ (5,904)	$ (7,400)	$ (7,248)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	(992)	(1,044)	(1,574)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	$ 0	$ 0	$ (194)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent	0.60%	2.10%	1.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent	(0.10%)	(0.20%)	0.00%
Effective income tax rate reconciliation, Portfolio optimization	0.00%	(21.60%)	0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	(2.50%)	20.50%	0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	0.00%	0.00%	(0.10%)
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	$ (318)	$ (336)	$ (334)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	(13,030)	(13,921)	(15,321)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Amount	(3,611)	(2,830)	(2,149)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount	(292)	(208)	7
Portfolio optimziation	$ 0	$ (29,109)	$ 0
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent	1.20%	4.80%	3.00%
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	$ 6,760	$ 6,500	$ 6,220
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent	(0.10%)	(0.20%)	(0.20%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 1,943	$ 3,610	$ 2,177
Effective Income Tax Rate Reconciliation, Changes in unrecognized tax benefits	0.20%	0.40%	0.00%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 431	$ 1,022	$ 480
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	0.10%	0.70%	0.20%
Income Tax Expense (Benefit)	$ 103,133	$ 11,314	$ 23,097
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.30%	2.70%	1.10%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ (14,337)	$ 27,525	$ 0
Effective Income Tax Rate Reconciliation, Changes in unrecognized tax benefits, amount	$ 1,017	$ 545	$ (6)
Effective Income Tax Rate Reconciliation, Percent, Total	17.90%	8.40%	11.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent	(1.00%)	(5.50%)	(3.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	(0.20%)	(0.80%)	(0.80%)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 121,361	$ 28,236	$ 43,271