CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 23,642	$ 22,983
Change in securities available-for-sale:
Unrealized holding gain (loss) on securities available-for-sale arising during the period	(138,995)	(15,297)
Reclassification adjustment for gains included in net income	0	(753)
Net securities gain (loss) activity during the period	(138,995)	(16,050)
Tax effect	29,188	3,371
Net of tax amount	(109,807)	(12,679)
Defined benefit pension plans:
Amortization of net actuarial loss	36	60
Net gain activity during the period	36	60
Tax effect	(9)	(15)
Net of tax amount	27	45
Total other comprehensive income (loss), net of tax	(109,780)	(12,634)
Comprehensive income (loss)	$ (86,138)	$ 10,349