Loss Reserves - Delinquent Items (Details) - loan	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Aging of the Primary Delinquent Inventory [Abstract]
3 months or less (in loans)	7,825		7,586	6,948
4 - 11 months (in loans)	7,619		7,990	9,371
12 months or more (in loans)	10,434		17,714	21,060
Total primary delinquent inventory (in loans)	25,878	26,855	33,290	37,379	42,999	57,710
3 months or less (as a percent)	30.00%		23.00%	19.00%
4 - 11 months (as a percent)	30.00%		24.00%	25.00%
12 months or more (as a percent)	40.00%		53.00%	56.00%
Total primary delinquent inventory (as a percent)	100.00%		100.00%	100.00%
Primary claims received inventory included in ending delinquent inventory (in loans)	244		211	154
Percent of 12 months or more delinquent inventory, delinquent for more than 36 months (as a percent)	33.00%		20.00%	17.00%