Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 39,678	$ 40,867	$ 73,225	$ 98,775
Securities available for sale:
Unrealized holding (losses) gains on securities	(56,958)	3,702	(157,420)	(11,241)
Reclassification adjustment for gains realized in net income	0	0	0	(1,012)
Amortization of unrealized holding gains on securities transferred to the held to maturity category	(164)	0	(238)	0
Total securities available for sale	(57,122)	3,702	(157,658)	(12,253)
Derivative instruments:
Unrealized holding gains (losses) on derivative instruments	6,262	(4,648)	12,641	6,336
Total derivative instruments	6,262	(4,648)	12,641	6,336
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost	31	57	62	99
Total defined benefit pension and post-retirement benefit plans	31	57	62	99
Other comprehensive loss, net of tax	(50,829)	(889)	(144,955)	(5,818)
Comprehensive (loss) income	$ (11,151)	$ 39,978	$ (71,730)	$ 92,957