Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 2,656	$ 15,548	$ 17,328	$ 30,403
Unrealized gain (loss) on securities:
Unrealized holding gain (loss) arising during period	6,548	(1,502)	13,167	(10,366)
Less: reclassification adjustment for net gain included in net income	(570)	(67)	(1,295)	(67)
Income tax (expense) benefit related to items of other comprehensive income	(1,721)	452	(3,418)	2,995
Other comprehensive income (loss), net of tax	4,257	(1,117)	8,454	(7,438)
Comprehensive income	$ 6,913	$ 14,431	$ 25,782	$ 22,965