CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 26,404	$ 23,338	$ 73,455	$ 69,288
Change in available-for-sale and transferred securities:
Unrealized holding gain on securities available-for-sale arising during the period	25,345	40,411	31,149	20,031
Reclassification adjustment for amortization of unrealized losses on securities transferred to held-to-maturity	489	488	1,468	1,473
Reclassification adjustment for (gains) losses included in net income	0	0	0	46
Net securities gain (loss) activity during the period	25,834	40,899	32,617	21,550
Tax effect	(5,426)	(8,589)	(6,850)	(4,526)
Net of tax amount	20,408	32,310	25,767	17,024
Defined benefit pension plans:
Amortization of net actuarial loss	14	16	40	47
Net gain activity during the period	14	16	40	47
Tax effect	(4)	(4)	(10)	(12)
Net of tax amount	10	12	30	35
Total other comprehensive income, net of tax	20,418	32,322	25,797	17,059
Comprehensive income	$ 46,822	$ 55,660	$ 99,252	$ 86,347