Condensed Consolidated Statements of Comprehensive Income (Unaudited) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Statement of Comprehensive Income [Abstract]
Net income	$ 133,377	$ 78,591	$ 119,339	$ 169,748
Available for sale securities:
Unrealized losses arising during the period	(145,743)	(152,399)	(305)	(389,445)
Income tax benefit related to unrealized losses	37,894	39,197	67	100,165
Reclassification adjustment for net realized gains in earnings	0	0	0	(2)
Income tax expense related to realized gains	0	0	0	1
Net change in unrealized losses for available for sale securities	(107,849)	(113,202)	(238)	(289,281)
Junior subordinated debentures, at fair value:
Unrealized (losses) gains arising during the period	(14,638)	(15,064)	11,174	(27,767)
Income tax benefit (expense) related to unrealized (losses) gains	3,806	3,875	(2,905)	7,142
Net change in unrealized (losses) gains for junior subordinated debentures, at fair value	(10,832)	(11,189)	8,269	(20,625)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent [Abstract]
Amortization of unrecognized net actuarial loss included in net periodic pension cost	72	0	96	0
Income tax expense related to unrecognized actuarial loss	(19)	0	(25)	0
Net change in pension plan liability adjustment	53	0	71	0
Other comprehensive (loss) income, net of tax	(118,628)	(124,391)	8,102	(309,906)
Comprehensive income (loss)	$ 14,749	$ (45,800)	$ 127,441	$ (140,158)
Merger Share Exchange Ratio			0.5958