CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 90,088	$ 96,302	$ 66,566	$ 255,058	$ (6,785)
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on securities available-for-sale arising during the period, net of income taxes	[1]	(20,138)	45,343	(11,747)	(47,387)	30,473
Reclassification adjustment for net (gain) loss on sales of securities included in net income, net of income taxes	[2]	(2,991)	(3,630)	(814)	(9,510)	(6,333)
Net unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of income taxes	[3]	(2,277)	0	0	(2,277)	0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of income taxes	[4]	58	0	0	58	0
Other comprehensive (loss) income, net of tax		(25,348)	41,713	(12,561)	(59,116)	24,140
Comprehensive income, net of tax		$ 64,740	$ 138,015	$ 54,005	$ 195,942	$ 17,355

[1] Income tax (benefit) expense of the unrealized (loss) gain on securities was $(8.1) million, $18.2 million, and $(4.7) million for the three months ended September 30, 2021, June 30, 2021, and September 30, 2020, respectively, and $(19.0) million and $12.3 million for the nine months ended September 30, 2021 and September 30, 2020, respectively.

[2] Income tax expense on the reclassification adjustment for net (gain) on sales of securities included in net income was $1.2 million, $1.5 million, and $327,000 for the three months ended September 30, 2021, June 30, 2021, and September 30, 2020, respectively, and $3.8 million and $2.5 million for the nine months ended September 30, 2021 and September 30, 2020, respectively.

[3] Income tax (benefit) on the unrealized loss on securities transferred from available-for-sale to held-to maturity was $(913,000) for the three and nine months ended September 30, 2021.

[4] Income tax expense on the amortization of unrealized (loss) on securities transferred from available-for-sale to held-to maturity included in net income was $24,000 for the three and nine months ended September 30, 2021.