Loss Reserves - Delinquent Items (Details) - loan	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Aging of the Primary Delinquent Inventory [Abstract]
3 months or less (in loans)	6,791		7,586	6,513
4 - 11 months (in loans)	7,946		7,990	12,840
12 months or more (in loans)	12,118		17,714	23,646
Total primary delinquent inventory (in loans)	26,855	30,462	33,290	42,999	52,775	57,710
3 months or less (as a percent)	25.00%		23.00%	15.00%
4 - 11 months (as a percent)	30.00%		24.00%	30.00%
12 months or more (as a percent)	45.00%		53.00%	55.00%
Total primary delinquent inventory (as a percent)	100.00%		100.00%	100.00%
Primary claims received inventory included in ending delinquent inventory (in loans)	254		211	159
Percent of 12 months or more delinquent inventory, delinquent for more than 36 months (as a percent)	29.00%		20.00%	15.00%