CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 93,478	$ 93,767	$ 103,817
Change in available-for-sale and transferred securities:
Unrealized holding gain (loss) on securities available-for-sale arising during the period	(16,530)	40,639	(261,256)
Reclassification adjustment for amortization of unrealized losses on securities transferred to held-to-maturity	1,962	1,987	1,518
Reclassification adjustment for (gains) losses included in net income	46	25	(21)
Net securities gain (loss) activity during the period	(14,522)	42,651	(259,759)
Tax effect	3,050	(8,957)	54,549
Net of tax amount	(11,472)	33,694	(205,210)
Defined benefit pension plans:
Net gain (loss) on defined benefit pension plans	160	(13)	115
Amortization of net actuarial loss	62	59	144
Net gain on activity during the period	222	46	259
Tax effect	(55)	(12)	(65)
Net of tax amount	167	34	194
Total other comprehensive income (loss), net of tax	(11,305)	33,728	(205,016)
Comprehensive income (loss)	$ 82,173	$ 127,495	$ (101,199)