Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (1,851,947)	$ 74,033
Available for sale securities:
Unrealized gains arising during the period	107,761	33,269
Income tax expense related to unrealized gains	(27,717)	(8,557)
Reclassification adjustment for net realized losses in earnings	133	0
Income tax benefit related to realized losses	(34)	0
Net change in unrealized gains for available for sale securities	80,143	24,712
Junior subordinated debentures, at fair value:
Unrealized gains arising during the period	78,862	6,564
Income tax expense related to unrealized gains	(20,283)	(1,644)
Net change in unrealized gains for junior subordinated debentures, at fair value	58,579	4,920
Other comprehensive income, net of tax	138,722	29,632
Comprehensive (loss) income	$ (1,713,225)	$ 103,665