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	$ 139,060	$ 96,413	$ 285,611	$ 213,141
Unrealized gains and losses on available for sale securities
Net losses arising during the period	(18,051)	(52,269)	(881)	(91,161)
Less reclassification adjustment for net gains included in net income	0	0	0	(10)
Total	(18,051)	(52,269)	(881)	(91,171)
Unrealized gains and losses on derivatives (cash flow hedges)
Net (losses) gains on derivatives arising during the period	(3,573)	(23)	(775)	195
Less reclassification adjustment for net losses (gains) included in net income	516	(80)	895	306
Total	(3,057)	(103)	120	501
Defined benefit pension and postretirement benefit plans
Amortization of actuarial net loss	8	133	16	265
Other comprehensive (loss) income, net	(21,100)	(52,239)	(745)	(90,405)
Total comprehensive income	$ 117,960	$ 44,174	$ 284,866	$ 122,736