CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 339,889	$ 60,351	$ 159,718
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on securities available-for-sale arising during the period, net of income taxes	[1]	(51,563)	48,674	33,226
Reclassification adjustment for net (gain) on sale of securities included in net income, net of income tax	[2]	(12,072)	(9,905)	(6,102)
Net unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of income taxes	[3]	(4,692)	0	0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of income taxes	[4]	173	0	0
Other comprehensive (loss) income, net of tax		(68,154)	38,769	27,124
Comprehensive income, net of tax		$ 271,735	$ 99,120	$ 186,842

[1] (1) Income tax (benefit) expense on unrealized (losses) gains on securities was $(20.6) million for 2021, $19.5 million for 2020, and $13.4 million for 2019.

[2] (2) Income tax expense on reclassification adjustment for net (gain) on sale of securities included in net income was $4.8 million for 2021, $4.0 million for 2020, and $2.5 million for 2019.

[3] (3) Income tax (benefit) on the unrealized loss on securities transferred from available-for-sale to held-to maturity was $(1.9) million for 2021, $0 for 2020, and $0 for 2019.

[4] (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 $70,000 for 2021, $0 for 2020, and $0 for 2019.