CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 96,302	$ 68,668	$ (99,091)	$ 164,970	$ (73,351)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on securities available-for-sale arising during the period, net of income taxes	[1]	45,343	(72,592)	13,800	(27,249)	42,220
Reclassification adjustment for net (gain) loss on sales of securities included in net income, net of income taxes	[2]	(3,630)	(2,889)	15	(6,519)	(5,519)
Other comprehensive income (loss), net of tax		41,713	(75,481)	13,815	(33,768)	36,701
Comprehensive income (loss), net of tax		$ 138,015	$ (6,813)	$ (85,276)	$ 131,202	$ (36,650)

[1] Income tax expense (benefit) on the unrealized gain (loss) on securities was $18.2 million for the three months ended June 30, 2021, $(29.1) million for the three months ended March 31, 2021, $5.5 million for the three months ended June 30, 2020, $(10.9) million for the six months ended June 30, 2021, and $17.0 million for the six months ended June 30, 2020.

[2] Income tax expense (benefit) on the reclassification adjustment for net (gain) loss on sales of securities included in net income was $1.5 million for the three months ended June 30, 2021, $1.2 million for the three months ended March 31, 2021, $(6,000) for the three months ended June 30, 2020, $2.6 million for the six months ended June 30, 2021, and $2.2 million for the six months ended June 30, 2020.