CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 23,338	$ 25,252	$ 69,288	$ 64,141
Change in available-for-sale and transferred securities:
Unrealized holding gain (loss) on securities available-for-sale arising during the period	40,411	(64,432)	20,031	(51,150)
Reclassification adjust for amortization of unrealized losses on securities transferred to held-to-maturity	488	501	1,473	1,486
Reclassification adjustment for (gains) losses included in net income	0	35	46	16
Net securities gain (loss) activity during the period	40,899	(63,896)	21,550	(49,648)
Tax effect	(8,589)	13,419	(4,526)	10,427
Net of tax amount	32,310	(50,477)	17,024	(39,221)
Defined benefit pension plans:
Amortization of net actuarial loss	16	15	47	45
Net gain activity during the period	16	15	47	45
Tax effect	(4)	(4)	(12)	(12)
Net of tax amount	12	11	35	33
Total other comprehensive income (loss), net of tax	32,322	(50,466)	17,059	(39,188)
Comprehensive income (loss)	$ 55,660	$ (25,214)	$ 86,347	$ 24,953