CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 97,856	$ 141,346	$ 264,560	$ 426,957
Unrealized gains and losses on available for sale securities
Net gains (losses) arising during the period	48,023	(37,115)	32,218	(37,996)
Less reclassification adjustment for net losses included in net income	1	5	9	5
Total	48,024	(37,110)	32,227	(37,991)
Unrealized gains and losses on derivatives (cash flow hedges)
Net losses on derivatives arising during the period	0	0	0	(775)
Less reclassification adjustment for net (gains) losses included in net income	(219)	(43)	(651)	852
Total	(219)	(43)	(651)	77
Defined benefit pension and postretirement benefit plans
Amortization of actuarial net loss	36	8	108	24
Other comprehensive income (loss) , net	47,841	(37,145)	31,684	(37,890)
Total comprehensive income	$ 145,697	$ 104,201	$ 296,244	$ 389,067