Condensed 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	$ 84,040	$ 108,066	$ 253,788	$ 331,946
Available for sale securities:
Unrealized losses arising during the period	(186,336)	(29,009)	(575,781)	(93,533)
Income tax benefit related to unrealized losses	47,926	7,463	148,091	24,058
Reclassification adjustment for net realized gains in earnings	0	0	(2)	(4)
Income tax expense related to realized gains	0	0	1	1
Net change in unrealized losses for available for sale securities	(138,410)	(21,546)	(427,691)	(69,478)
Junior subordinated debentures, at fair value:
Unrealized losses arising during the period	(4,043)	(11,946)	(31,810)	(44,504)
Income tax benefit related to unrealized losses	1,040	3,072	8,182	11,446
Net change in unrealized losses for junior subordinated debentures, at fair value	(3,003)	(8,874)	(23,628)	(33,058)
Other comprehensive loss, net of tax	(141,413)	(30,420)	(451,319)	(102,536)
Comprehensive (loss) income	$ (57,373)	$ 77,646	$ (197,531)	$ 229,410