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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Effects of Reinsurance [Line Items]            
Reinsurance recoverable on paid losses $ 310   $ 310   $ 36,275  
Reinsurance recoverable on loss reserves 53,958 $ 111,153 53,958 $ 111,153 66,905 $ 95,042
Ceded premiums $ 34,270 43,988 68,429 87,625    
Reinsurance Contract [Axis]: Excess of Loss Reinsurance Coverage on New Insurance Written            
Effects of Reinsurance [Line Items]            
Excess of loss reinsurance coverage     $ 175,000      
Approximate contractual termination term 10 years   10 years      
Optional termination term 7 years   7 years      
Home Re special purpose insurers            
Effects of Reinsurance [Line Items]            
Percent of total trust assets invested in cash or direct U.S. federal government obligations     99.50%      
Quota Share Reinsurance Transactions            
Effects of Reinsurance [Line Items]            
Ceding commission, percentage (as a percent)     20.00%      
Reinsurance, Quota Share Reinsurance Agreement, Terms, Annual Loss Ratio Cap 300.00%   300.00%      
Reinsurance, Quota Share Reinsurance Agreement, Terms, Lifetime Loss Ratio Cap 200.00%   200.00%      
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent)     90.00%      
Reinsurance recoverable on loss reserves $ 54,000   $ 54,000   66,900  
Credit Union QSR Transaction            
Effects of Reinsurance [Line Items]            
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent)     80.00%      
QSR Transactions, 2017 & 2018            
Effects of Reinsurance [Line Items]            
Reinsurance recoverable on paid losses         $ 36,000  
Aggregate Excess of Loss Reinsurance Transactions, Home Re            
Effects of Reinsurance [Line Items]            
Ceded premiums $ 18,200 $ 10,000 $ 30,000 $ 20,300    
Aggregate Excess of Loss Reinsurance Transactions, Home Re | Minimum            
Effects of Reinsurance [Line Items]            
Amortization period excess of loss reinsurance coverage     10 years      
Aggregate Excess of Loss Reinsurance Transactions, Home Re | Maximum            
Effects of Reinsurance [Line Items]            
Amortization period excess of loss reinsurance coverage     12 years 6 months