Losses and LAE - Mortgage Insurance Reserve for Losses and LAE Rollforward (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Loss reserve [Roll Forward]
Balance at beginning of period	$ 426,843
Deduct: Paid claims and LAE related to:
Balance at end of period	379,434
Mortgage
Loss reserve [Roll Forward]
Balance at beginning of period	420,955	$ 823,136
Less: Reinsurance recoverables	24,727	66,676
Balance at beginning of period, net of reinsurance recoverables	351,563	549,993	$ 396,228	$ 756,460
Add: Losses and LAE incurred in respect of default notices reported and unreported in:
Current year	87,594	75,931
Prior years	(126,081)	(274,397)
Total incurred	(38,487)	(198,466)
Deduct: Paid claims and LAE related to:
Current year	40	165
Prior years	6,138	7,836
Total paid	6,178	8,001
Balance at end of period, net of reinsurance recoverables	351,563	549,993
Add: Reinsurance recoverables	22,118	38,954
Balance at end of period	$ 373,681	$ 588,947