Loss Reserves - Default Inventory Reconciliation (Details) - loan	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Primary Default Inventory [Roll Forward]
Beginning delinquent inventory	57,710	30,028	32,898
New Notices	42,432	106,099	54,239
Cures	(64,896)	(76,107)	(52,035)
Paid claims	(1,223)	(2,245)	(4,267)
Rescissions and denials	(38)	(65)	(168)
Other items removed from inventory	(695)	0	(639)
Ending delinquent inventory	33,290	57,710	30,028