Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	$ 26,319	$ 16,232	$ 45,013	$ 29,498
Other comprehensive income, net of tax	882	930	1,273	1,826
Comprehensive income	27,201	17,162	46,286	31,324
Available-for-sale debt securities:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in net unrealized gain (loss)	1,093	724	1,444	1,379
Reclassification adjustment	(15)	15	(100)	43
Other comprehensive income, net of tax	1,078	739	1,344	1,422
Cash flow hedges:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in net unrealized gain (loss)	(108)	148	208	351
Reclassification adjustment	(88)	43	(279)	53
Other comprehensive income, net of tax	(196)	191	(71)	404
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	$ 26,319	$ 16,232	$ 45,013	$ 29,498