Losses and LAE - Mortgage Insurance Reserve for Losses and LAE Rollforward (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Loss reserve [Roll Forward]
Balance at beginning of period	$ 828,642
Deduct: Paid claims and LAE related to:
Balance at end of period	594,808
Mortgage
Loss reserve [Roll Forward]
Balance at beginning of period	823,136	$ 844,107
Less: Reinsurance recoverables	66,676	71,769
Balance at beginning of period, net of reinsurance recoverables	549,993	806,757	$ 756,460	$ 772,338
Add: Losses and LAE incurred in respect of default notices reported and unreported in:
Current year	75,931	85,807
Prior years	(274,397)	(36,695)
Total incurred	(198,466)	49,112
Deduct: Paid claims and LAE related to:
Current year	165	246
Prior years	7,836	14,447
Total paid	8,001	14,693
Balance at end of period, net of reinsurance recoverables	549,993	806,757
Add: Reinsurance recoverables	38,954	74,006
Balance at end of period	$ 588,947	$ 880,763