Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Fixed income securities, allowance for credit loses	$ 825	$ 1,035
Commercial mortgage loans, allowance	195	195
Account receivable, allowance	19,960	19,960
Reinsurance recoverable, allowance	$ 987	$ 972
Class A Voting [Member]
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, shares outstanding (in shares)	2,603,350	2,603,350
Class B Non-voting [Member]
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares outstanding (in shares)	11,705,070	11,674,345