Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax
Balance at the beginning of period, gross	$ 34,898	$ (18,740)	$ (29,760)	$ 22,265
Unrealized holding gains (losses) on fixed income securities, gross	11,943	(193)	76,576	(40,224)
Amounts reclassified into net loss, gross	4,362	307	4,337	1,281
Other comprehensive income, gross	7,581	(500)	72,239	(41,505)
Balance at the end of period, gross	42,479	(19,240)	42,479	(19,240)
Balance at the beginning of period, tax	6,054	(5,348)	(7,445)	2,968
Unrealized holding gains (losses) on fixed income securities, tax	2,651	335	16,098	(8,090)
Amounts reclassified into net loss, tax	156	278	104	169
Other comprehensive income, tax	2,495	57	15,994	(8,259)
Balance at the end of period, tax	8,549	(5,291)	8,549	(5,291)
Balance at the beginning of period, net	28,844	(13,392)	(22,315)	19,297
Unrealized holding gains (losses) on fixed income securities	9,292	(528)	60,478	(32,134)
Amounts reclassified into net income	4,206	29	4,233	1,112
Other comprehensive income (loss)	5,086	(557)	56,245	(33,246)
Balance at the end of period, net	$ 33,930	$ (13,949)	$ 33,930	$ (13,949)