Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 166,068	$ 175,892	$ 83,651
Securities available for sale:
Unrealized holding (losses) gains on securities	(214,351)	(38,371)	20,717
Reclassification adjustment for gains realized in net income	0	(1,618)	(34)
Amortization of unrealized holding losses (gains) on securities transferred to the held to maturity category	3,701	(54)	0
Total securities available for sale	(210,650)	(40,043)	20,683
Derivative instruments:
Unrealized holding gains on derivative instruments	14,993	8,087	688
Reclassification adjustment for (gains) losses realized in net income related to swap termination	0	(3,486)	1,521
Total derivative instruments	14,993	4,601	2,209
Defined benefit pension and post-retirement benefit plans:
Net (loss) gain arising during the period	(3,062)	(264)	797
Reclassification adjustment for settlement loss related to the voluntary early retirement program realized in net income	0	0	422
New prior service cost	0	0	(362)
Amortization of net actuarial loss recognized in net periodic pension cost	125	195	193
Amortization of prior service cost	0	0	362
Total defined benefit pension and post-retirement benefit plans	(2,937)	(69)	1,412
Other comprehensive (loss) income, net of tax	(198,594)	(35,511)	24,304
Comprehensive (loss) income	$ (32,526)	$ 140,381	$ 107,955