CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 11,425	$ 10,807
Unrealized gains/(losses) on available for sale securities:
Unrealized holding gains/(losses) arising during the period	2,288	(2,934)
Before tax	2,288	(2,934)
Tax effect	(560)	676
Net of tax	1,728	(2,258)
Unrealized gains on cash flow hedges:
Unrealized holding gains/(losses) arising during the period	(1,547)	741
Reclassification adjustment for amounts included in net income	(31)	(31)
Before tax	(1,578)	710
Tax effect	466	(209)
Net of tax	(1,112)	501
Total other comprehensive income/(loss)	616	(1,757)
Total comprehensive income	$ 12,041	$ 9,050