CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 26,560	$ 23,577
Available-for-sale investment securities:
Gross unrealized holding gain (loss) arising during the period	20,362	(71,637)
Related tax (expense) benefit	(4,647)	16,448
Reclassification adjustment for net loss (gain) included in net income	1,935	(130)
Related tax (expense) benefit	(452)	30
Net effect on other comprehensive income (loss)	17,198	(55,289)
Defined benefit plan:
Net loss arising during the period	0	(14)
Related tax benefit	0	3
Amortization of unrecognized loss and service cost on benefit plans	2	21
Related tax benefit	0	(5)
Net effect on other comprehensive income (loss)	2	5
Cash flow hedges:
Net (loss) gain arising during the period	(1,356)	5,456
Related tax benefit (expense)	313	(1,220)
Net effect on other comprehensive income (loss)	(1,043)	4,236
Total other comprehensive gain (loss), net of tax	16,157	(51,048)
Total comprehensive income (loss)	$ 42,717	$ (27,471)