Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 92,739	$ 89,217	$ 48,190
Other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on available-for-sale debt securities, net of tax effect of $9,575, $(1,518), and $(1,272), respectively	29,189	(4,626)	(2,076)
Reclassification adjustment for realized (gain) loss on the sale of available-for-sale debt securities, net of tax effect of $(12), $2, and $9, respectively	37	(7)	(13)
Other Comprehensive Income (Loss), Reclassification of (gain) loss on held to maturity securities, net of tax	(33)	3	12
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(2,262)	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	100	0	0
Other comprehensive income (loss), net	27,031	(4,630)	(2,077)
Total comprehensive income	$ 119,770	$ 84,587	$ 46,113