Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 28,643	$ 39,678	$ 74,721	$ 73,225
Securities available for sale:
Unrealized holding losses on securities	(15,930)	(56,958)	(399)	(157,420)
Reclassification adjustment for losses realized in net income	16,816	0	16,816	0
Amortization of unrealized holding losses (gains) on securities transferred to the held to maturity category	2,252	(164)	4,580	(238)
Total securities available for sale	3,138	(57,122)	20,997	(157,658)
Derivative instruments:
Unrealized holding (losses) gains on derivative instruments	(2,361)	6,262	(3,593)	12,641
Total derivative instruments	(2,361)	6,262	(3,593)	12,641
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	86	31	172	62
Total defined benefit pension and post-retirement benefit plans	86	31	172	62
Other comprehensive income (loss), net of tax	863	(50,829)	17,576	(144,955)
Comprehensive income (loss)	$ 29,506	$ (11,151)	$ 92,297	$ (71,730)