Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 18,723	$ 20,404
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on debt securities available for sale	13,069	(57,815)
Accretion of unrealized (loss) on debt securities reclassified as held to maturity	(7)	(3)
Reclassification adjustment for (loss) included in net income	(929)	0
Total other comprehensive (loss) income, net of tax	12,133	(57,818)
Derivatives, net of tax:
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges	(865)	3,157
Total derivative, net of tax	(865)	3,157
Employee benefit plans, net of tax:
Amortization of prior service cost included in net income	(10)	(11)
Reclassification adjustment of actuarial net gain (loss) included in net income	1	(244)
Change in funded status of retirement obligations	179	480
Total employee benefit plans, net of tax	170	225
Total other comprehensive income (loss)	11,438	(54,436)
Total comprehensive income (loss), net of tax	$ 30,161	$ (34,032)