Condensed Consolidated Statements of Comprehensive Income (Unaudited) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (14,038)	$ 91,157
Available for sale securities:
Unrealized gains (losses) arising during the period	145,438	(237,046)
Income tax (expense) benefit related to unrealized (gains) losses	(37,827)	60,968
Reclassification adjustment for net realized gains in earnings	0	(2)
Income tax expense related to realized gains	0	1
Net change in unrealized gains (losses) for available for sale securities	107,611	(176,079)
Junior subordinated debentures, at fair value:
Unrealized gains (losses) arising during the period	25,812	(12,703)
Income tax (expense) benefit related to unrealized gains (losses)	(6,711)	3,267
Net change in unrealized gains (losses) for junior subordinated debentures, at fair value	19,101	(9,436)
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	24	0
Income tax expense related to unrecognized actuarial loss	(6)	0
Net change in pension plan liability adjustment	18	0
Other comprehensive income (loss), net of tax	126,730	(185,515)
Comprehensive income (loss)	$ 112,692	$ (94,358)
Merger Share Exchange Ratio	0.5958