Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 7,679	$ 3,661	$ 19,698	$ 7,866
Other comprehensive income:
Unrealized (loss) gain on securities (net of tax benefit of $1 and tax expense of $44 in 2017, and net of tax benefit of $34 and tax expense of $37 in 2016, respectively)	(1)	(49)	63	53
Accretion of unrealized loss on securities reclassified to held-to-maturity (net of tax expense of $128 and $244 in 2017 and net of tax expense of $128 and $277 in 2016, respectively)	185	186	353	402
Reclassification adjustment for losses included in net income (net of tax benefit of $5 in 2016)	0	(12)	0	(12)
Total comprehensive income	$ 7,863	$ 3,786	$ 20,114	$ 8,309