CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 103,817	$ 95,733	$ 84,337
Change in available-for-sale and transferred securities:
Unrealized holding gain (loss) on securities available-for-sale arising during the period	(261,256)	(14,553)	20,148
Reclassification adjustment for amortization of unrealized losses on securities transferred to held-to-maturity	1,518	0	0
Reclassification adjustment for gains included in net income	(21)	(797)	(433)
Net securities gain (loss) activity during the period	(259,759)	(15,350)	19,715
Tax effect	54,549	3,224	(4,140)
Net of tax amount	(205,210)	(12,126)	15,575
Defined benefit pension plans:
Net gain (loss) on defined benefit pension plans	115	390	(105)
Amortization of net actuarial loss	144	242	251
Net gain (loss) on activity during the period	259	632	146
Tax effect	(65)	(157)	(36)
Net of tax amount	194	475	110
Total other comprehensive income (loss), net of tax	(205,016)	(11,651)	15,685
Comprehensive income (loss)	$ (101,199)	$ 84,082	$ 100,022