Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 28,839	$ 18,679	$ 86,895	$ 20,972
Investment securities available-for-sale:
Unrealized securities holding gains (losses)	(4,450)	(735)	(17,797)	24,380
Income tax (expense) benefit	981	167	3,923	(5,366)
Net unrealized securities holding gains (losses) before reclassification adjustments, net of taxes	(3,469)	(568)	(13,874)	19,014
Less reclassification adjustments for securities gains (losses) included in net income:
Gain (loss) on sales of securities, net	0	250	0	3,237
Income tax expense (benefit)	0	(55)	0	(715)
Net reclassification adjustments for securities gains (losses) included in net income	0	195	0	2,522
Net unrealized securities holding gains (losses)	(3,469)	(763)	(13,874)	16,492
Cash flow hedges:
Change in fair value of cash flow hedges	(3)	7	6	7
Reclassification adjustment for (income) expense recognized in earnings	(2)	0	(7)	0
Net change in fair value of cash flow hedges	(5)	7	(1)	7
Other comprehensive income (loss), net of taxes	(3,474)	(756)	(13,875)	16,499
Comprehensive income (loss)	$ 25,365	$ 17,923	$ 73,020	$ 37,471