Reserves For Claims Summary Of The Company's Loss Reserves (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Known title claims	$ 3,402	$ 3,585
IBNR	33,353	29,999
Total reserve for claims	$ 36,755	$ 33,584	$ 31,333
% of known title reserves	9.30%	10.70%
% of IBNR	90.70%	89.30%
% of total loss reserves	100.00%	100.00%