Nature of Operations and Summary of Significant Accounting Policies Narrative (Details) $ / shares in Units, $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2018 CAD ($) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 CAD ($)
Accounting Policies [Abstract]
Stock Issued During Period, Shares, New Issues | shares	2,090,909	2,090,909
Impairment, Amount, License Intangibles	$ 0		$ 0	$ 0
Realized Investment Gains (Losses)	0
Other Nonoperating Income (Expense)	1,309		1,244	58
Equity Method Investment, Realized Gain (Loss) on Disposal			1,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	700		100	400
Premiums Recognized from Fronting Agreement	57,400		47,100	36,500
Deferred Policy Acquisition Costs	1,300		1,000
Advertising Expense	6,300		4,900	4,000
Deferred Revenue from Fronting Agreement	$ 2,100		$ 1,800
Concentration Risk, Percentage	19.00%	19.00%	19.00%
Cash Designated for Paying Reinsurance Claims	$ 3,900		$ 2,800
Reinsurance Trust Minimum Payment		$ 2.0
Reinsurance Trust Payment Unearned Premium Percentage	115.00%	115.00%
Reinsurance Payment of Percentage of Canadian Claims outstanding	15.00%	15.00%
Reinsurance Trust Balance					$ 3.5
Interest Income, Other	$ 900		$ 200	$ 100
Shares Issued, Price Per Share | $ / shares	$ 33.00
Proceeds from Issuance or Sale of Equity	$ 65,671
Proceeds from Rents Received	$ 900