CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 28,002	$ 16,171	$ 9,521
Other comprehensive income, net of tax:
Unrealized holding (loss)/gain on securities arising during the period, net of income taxes	[1]	(9,343)	(2,216)	1,013
Reclassification adjustment for net (gains) losses on sale of securities included in net income, net of income taxes	[2]	(5)	155	0
Other comprehensive (loss) income, net of tax		(9,348)	(2,061)	1,013
Comprehensive income, net of tax		$ 18,654	$ 14,110	$ 10,534

[1] Income tax (benefit) expense on the unrealized (loss)/gain on securities was $(3.9) million for the three months ended March 31, 2018, $(1.6) million for the three months ended December 31, 2017, $714,000 for the three months ended March 31, 2017.

[2] Income tax expense (benefit) on the reclassification adjustment for net (gains) losses on sale of securities included in net income was $1,000 for the three months ended March 31, 2018, $(97,000) for the three months ended December 31, 2017, $0 for the three months ended March 31, 2017.