CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 13,071	$ 15,342	$ 25,176	$ 41,150
Securities available-for-sale
Unrealized holding gains arising during the period	33	3,992	30,100	24,954
Reclassification adjustments for net gains included in net income	(1,037)	(178)	(2,412)	(1,151)
Tax effect	280	(1,062)	(7,710)	(6,762)
Net of tax	(724)	2,752	19,978	17,041
Cash flow hedges
Unrealized holding losses arising during the period		(251)		(5,484)
Reclassification adjustments for net losses (gains) included in net income	22	(363)	64	(1,643)
Tax effect	(7)	171	(18)	1,985
Net of tax	15	(443)	46	(5,142)
Total other comprehensive income (loss)	(709)	2,309	20,024	11,899
Comprehensive income	$ 12,362	$ 17,651	$ 45,200	$ 53,049