Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 18,922	$ 8,464
Securities available-for-sale:
Net unrealized gains (losses) arising during the period, net of tax (expense) benefit of ($1,706) and $2,301 for the three months ended March 31, 2019 and 2018, respectively	5,417	(6,780)
Less: amortization of net unrealized holding gains to income, net of tax benefit of $90 and $70 for the three months ended March 31, 2019 and 2018, respectively	(282)	(387)
Other comprehensive income (loss)	5,135	(7,167)
Comprehensive income	$ 24,057	$ 1,297