Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 12,018	$ 4,205
Other comprehensive income:
Unrealized gain on securities (net of tax expense of $44 and $71 in 2017 and 2016, respectively)	64	102
Accretion of unrealized loss on securities reclassified to held-to-maturity (net of tax expense of $116 and $149 in 2017 and 2016, respectively)	168	216
Total comprehensive income	$ 12,250	$ 4,523