CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 15,342	$ 14,536	$ 41,150	$ 24,072
Securities available-for-sale
Unrealized holding gains (losses) arising during the period	3,992	(3,451)	24,954	(14,859)
Reclassification adjustments for net gains included in net income	(178)		(1,151)	(4)
Tax effect	(1,062)	961	(6,762)	4,138
Net of tax	2,752	(2,490)	17,041	(10,725)
Cash flow hedges
Unrealized holding gains (losses) arising during the period	(251)	1,070	(5,484)	6,702
Reclassification adjustments for net gains included in net income	(363)	(428)	(1,643)	(863)
Tax effect	171	(179)	1,985	(1,626)
Net of tax	(443)	463	(5,142)	4,213
Total other comprehensive income (loss)	2,309	(2,027)	11,899	(6,512)
Comprehensive income	$ 17,651	$ 12,509	$ 53,049	$ 17,560