Schedule V. Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for bad debts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 1,239	$ 785	$ 1,255
Charged to costs and expenses		0	454	0
Deductions		552	0	470
Balance at end of period		687	1,239	785
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	[1]	0	0	329
Charged to costs and expenses	[1]	0	0	0
Deductions	[1]	0	0	329
Balance at end of period	[1]	$ 0	$ 0	$ 0

[1] Recorded in connection with the purchase of American Indemnity Financial Corporation in 1999