Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 20,404	$ 21,045
Other comprehensive (loss) income, net of tax:
Unrealized (loss) on debt securities available for sale	(57,815)	(17,034)
Accretion of unrealized (loss) gain on debt securities reclassified as held to maturity	(3)	14
Total other comprehensive (loss) income, net of tax	(57,818)	(17,020)
Derivatives, net of tax:
Unrealized gain on swap contracts accounted for as cash flow hedges	3,157	5,683
Total derivative, net of tax	3,157	5,683
Employee benefit plans, net of tax:
Amortization of prior service cost included in net income	(11)	(10)
Reclassification adjustment of actuarial net (loss) included in net income	(244)	(1,089)
Change in funded status of retirement obligations	480	9,554
Total employee benefit plans, net of tax	225	8,455
Total other comprehensive (loss)	(54,436)	(2,882)
Total comprehensive (loss) income, net of tax	$ (34,032)	$ 18,163