Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 31,602	$ 19,571	$ 58,056	$ 2,295
Investment securities available-for-sale:
Unrealized securities holding gains (losses)	5,135	3,952	(13,346)	25,115
Income tax (expense) benefit	(1,132)	(867)	2,941	(5,533)
Net unrealized securities holding gains (losses) before reclassification adjustments, net of taxes	4,003	3,085	(10,405)	19,582
Less reclassification adjustments for securities gains (losses) included in net income:
Gain (loss) on sales of securities, net	0	634	0	2,987
Income tax expense (benefit)	0	(140)	0	(660)
Net reclassification adjustments for securities gains (losses) included in net income	0	494	0	2,327
Net unrealized securities holding gains (losses)	4,003	2,591	(10,405)	17,255
Cash flow hedges:
Change in fair value of cash flow hedges	8	0	9	0
Reclassification adjustment for (income) expense recognized in earnings	(4)	0	(5)	0
Net change in fair value of cash flow hedges	4	0	4	0
Other comprehensive income (loss), net of taxes	4,007	2,591	(10,401)	17,255
Comprehensive income (loss)	$ 35,609	$ 22,162	$ 47,655	$ 19,550