Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Comprehensive Income
Net income	$ 99,601	$ 83,195	$ 62,387
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses) during the period, net of income tax expense (benefit) of $10,964, ($5,387), and $6,027.	41,247	(20,267)	12,349
Reclassification adjustment for net realized gains on investments included in net income, net of income tax expense of ($625), ($678), and ($2,112).	(2,351)	(2,549)	(3,923)
Other comprehensive income (loss), net of tax:	38,896	(22,816)	8,426
Comprehensive income	$ 138,497	$ 60,379	$ 70,813