CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income		$ 68,668	$ 67,136	$ 25,740
Other comprehensive income (loss), net of tax:
Unrealized holding (loss) gain on securities available-for-sale arising during the period, net of income taxes	[1]	(72,592)	18,201	28,420
Reclassification adjustment for net (loss) gain on sales of securities included in net income, net of income taxes	[2]	(2,889)	(3,572)	(5,534)
Other comprehensive (loss) income, net of tax		(75,481)	14,629	22,886
Comprehensive (loss) income, net of tax		$ (6,813)	$ 81,765	$ 48,626

[1] Income tax (benefit) expense on the unrealized (loss) gain on securities was $(29.1) million for the three months ended March 31, 2021, $7.2 million for the three months ended December 31, 2020, and $11.4 million for the three months ended March 31, 2020.

[2] Income tax expense (benefit) on the reclassification adjustment for net gain (loss) on sales of securities included in net income was $1.2 million for the three months ended March 31, 2021, $1.4 million for the three months ended December 31, 2020, and $2.2 million for the three months ended March 31, 2020.