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Segment Reporting - Revenue and Other Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net premiums earned $ 951,283 $ 919,578 $ 981,131
Total services revenue 50,270 46,092 92,216
Net investment income 292,693 258,430 195,658
Net gains (losses) on investments and other financial instruments (10,114) 10,241 (80,733)
Income (loss) on consolidated VIEs (2) 0 0
Other income 6,153 6,247 2,454
Total revenues 1,290,283 1,240,588 1,190,726
Provision for losses (2,514) (42,526) (338,239)
Policy acquisition costs 27,316 24,578 23,918
Allocated corporate operating expenses 169,255 163,858 163,000
Interest expense 108,014 89,695 84,454
Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Adjusted pretax operating income 827,363 829,824 1,131,943
All Other      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net premiums earned 12,046 10,215 23,918
Total services revenue 49,646 45,394 85,158
Net investment income 91,240 63,353 24,437
Net gains (losses) on investments and other financial instruments (5,798) 814 47
Income (loss) on consolidated VIEs (2)    
Other income 582 27 248
Total revenues 147,714 119,803 133,808
Inter-segment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net premiums earned 0 0 0
Total services revenue (401) (390) (332)
Net investment income 0 0 0
Net gains (losses) on investments and other financial instruments 0 0 0
Income (loss) on consolidated VIEs 0    
Other income (78) (20) (170)
Total revenues (479) (410) (502)
Adjustments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net premiums earned 0 0 0
Total services revenue 0 0 0
Net investment income 0 0 0
Net gains (losses) on investments and other financial instruments (4,316) 9,427 (80,780)
Income (loss) on consolidated VIEs 0    
Other income 0 868 0
Total revenues (4,316) 10,295 (80,780)
Mortgage insurance      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Provision for losses (2,248) (42,136) (339,374)
Mortgage insurance | Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net premiums earned 939,237 909,363 957,213
Total services revenue 1,025 1,088 7,390
Net investment income 201,453 195,077 171,221
Net gains (losses) on investments and other financial instruments 0 0 0
Income (loss) on consolidated VIEs 0    
Other income 5,649 5,372 2,376
Total revenues 1,147,364 1,110,900 1,138,200
Provision for losses (2,248) (42,136) (339,374)
Policy acquisition costs 27,316 24,578 23,918
Direct other operating expenses 66,417 71,150 92,756
Allocated corporate operating expenses 144,251 140,583 138,566
Interest expense 83,731 86,188 84,440
Other segment items 534 713 5,951
Adjusted pretax operating income 827,363 829,824 1,131,943
Direct depreciation expense $ 7,974 $ 8,164 $ 8,986
Loss Ratio (0.20%) (4.60%) (35.50%)
Expense Ratio 25.30% 26.00% 26.70%