Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 15,962	$ 19,584	$ 50,387	$ 39,166
Securities available for sale
Unrealized gains (losses) arising during period	(1,663)	2,675	(2,282)	12,599
Change in unrealized gains and losses for which a portion of other than temporary impairment has been recognized in earnings	0	15	0	(66)
Reclassification adjustments for gains included in earnings	(5)	0	(1,421)	(253)
Unrealized gains (losses) recognized in other comprehensive income (loss) on securities available for sale	(1,668)	2,690	(3,703)	12,280
Income tax expense (benefit)	(350)	565	(777)	2,579
Unrealized gains (losses) recognized in other comprehensive income (loss) on securities available for sale, net of tax	(1,318)	2,125	(2,926)	9,701
Derivative instruments
Unrealized losses arising during period	0	(26)	0	(354)
Reclassification adjustment for expense recognized in earnings	0	310	0	646
Unrealized gains recognized in other comprehensive income (loss) on derivative instruments	0	284	0	292
Income tax expense	0	59	0	61
Unrealized gains recognized in other comprehensive income (loss) on derivative instruments, net of tax	0	225	0	231
Other comprehensive income (loss)	(1,318)	2,350	(2,926)	9,932
Comprehensive income	$ 14,644	$ 21,934	$ 47,461	$ 49,098