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Loss Reserves - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Minimum number of payments past due to be in default | loan 2    
Change in loss reserves (+/-) $ (42,717) $ (52,609) $ (325,534)
Premium refund liability, expected claim payments 12,500 $ 21,100  
$1,000 Increase/Decrease In Average Severity Reserve Factor      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Change in loss reserves (+/-) 7,000    
One Percentage Point Increase/Decrease In Average Claim Rate Reserve Factor      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Change in loss reserves (+/-) $ 18,000