CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 66,566	$ (99,091)	$ 41,375	$ (6,785)	$ 118,620
Other comprehensive income, net of tax:
Unrealized holding (loss) gain on securities available-for-sale arising during the period, net of income taxes	[1]	(11,747)	13,800	10,864	30,473	39,280
Reclassification adjustment for net (loss) gain on sales of securities included in net income, net of income taxes	[2]	(814)	15	(3,027)	(6,333)	(3,484)
Other comprehensive (loss) income, net of tax		(12,561)	13,815	7,837	24,140	35,796
Comprehensive income (loss), net of tax		54,005	(85,276)	49,212	17,355	154,416
Unrealized holding gain (loss) on securities arising during the period, income tax expense (benefit)		(4,700)	5,500	4,400	12,300	16,000
Reclassification adjustment for net (gains) losses on sale of securities included in net income, income tax expense (benefit)		$ 327	$ (6)	$ 1,200	$ 2,500	$ 1,400

[1] Income tax (benefit) expense on the unrealized gain on securities was $(4.7) million for the three months ended September 30, 2020, $5.5 million for the three months ended June 30, 2020, $4.4 million for the three months ended September 30, 2019, $12.3 million for the nine months ended September 30, 2020, and $16.0 million for the nine months ended September 30, 2019.

[2] Income tax expense (benefit) on the reclassification adjustment for net gain (loss) on sales of securities included in net income was $327,000 for the three months ended September 30, 2020, $(6,000) for the three months ended June 30, 2020, $1.2 million for the three months ended September 30, 2019, $2.5 million for the nine months ended September 30, 2020, and $1.4 million for the nine months ended September 30, 2019.