CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 178,119	$ 122,580	$ 391,260	$ 358,802
Unrealized gains and losses on available for sale securities
Net losses arising during the period	(57,242)	(3,953)	(148,403)	(15,860)
Less reclassification adjustment for net gains included in net income	(12)	(613)	(22)	(493)
Total	(57,254)	(4,566)	(148,425)	(16,353)
Unrealized gains and losses on derivatives (cash flow hedges)
Net (losses) gains on derivatives arising during the period	(85)	(96)	110	(69)
Less reclassification adjustment for net (gains) losses included in net income	(13)	743	293	1,928
Total	(98)	647	403	1,859
Defined benefit pension plan
Amortization of actuarial net loss	132	279	397	837
Other comprehensive (loss) income, net	(57,220)	(3,640)	(147,625)	(13,657)
Total comprehensive income	$ 120,899	$ 118,940	$ 243,635	$ 345,145