CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2020		Mar. 31, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (99,091)		$ 25,740		$ 38,527		$ (73,351)	$ 77,245
Other comprehensive income, net of tax:
Unrealized holding gain (loss) on securities available-for-sale arising during the period, net of income taxes	13,800	[1]	28,420	[1]	17,449	[1]	42,220	28,416
Reclassification adjustment for net gain on sale of securities included in net income, net of income taxes	15	[2]	(5,534)	[2]	(151)	[2]	(5,519)	(457)
Other comprehensive income, net of tax	13,815		22,886		17,298		36,701	27,959
Comprehensive (loss) income, net of tax	(85,276)		48,626		55,825		(36,650)	105,204
Unrealized holding gain (loss) on securities arising during the period, income tax expense (benefit)	5,500		11,400		7,100		17,000	11,600
Reclassification adjustment for net (gains) losses on sale of securities included in net income, income tax expense (benefit)	$ (6)		$ 2,200		$ 61		$ 2,200	$ 182

[1] Income tax expense on the unrealized gain on securities was $5.5 million for the three months ended June 30, 2020, $11.4 million for the three months ended March 31, 2020 and $7.1 million for the three months ended June 30, 2019, $17.0 million for the six months ended June 30, 2020 and $11.6 million for the six months ended June 30, 2019.

[2] Income tax expense (benefit) on the reclassification adjustment for net gain (loss) on sales of securities included in net income was $(6,000) for the three months ended June 30, 2020, $2.2 million for the three months ended March 31, 2020, $61,000 for the three months ended June 30, 2019, $2.2 million for the six months ended June 30, 2020 and $182,000 for the six months ended June 30, 2019.