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	$ 24,278	$ 23,642
Change in available-for-sale and transferred securities:
Unrealized holding gain (loss) on securities available-for-sale arising during the period	26,793	(138,995)
Reclassification adjust for amortization of unrealized losses on securities transferred to held-to-maturity	491	0
Reclassification adjustment for gains included in net income	(16)	0
Net securities gain (loss) activity during the period	27,268	(138,995)
Tax effect	(5,726)	29,188
Net of tax amount	21,542	(109,807)
Defined benefit pension plans:
Amortization of net actuarial loss	15	36
Net gain activity during the period	15	36
Tax effect	(4)	(9)
Net of tax amount	11	27
Total other comprehensive income (loss), net of tax	21,553	(109,780)
Comprehensive income (loss)	$ 45,831	$ (86,138)