v3.26.1
Regulatory Information - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2026
Jun. 03, 2026
Dec. 31, 2025
NMIC and Re One combined              
Statutory Accounting Practices [Line Items]              
Net income amount $ 44,000 $ 30,500 $ 76,800 $ 67,300      
Statutory capital 3,395,144   3,395,144       $ 3,255,546
Aggregate dividend capacity           $ 101,000  
NMIC and Re One combined | Forecast              
Statutory Accounting Practices [Line Items]              
Aggregate dividend capacity         $ 101,000    
Re One              
Statutory Accounting Practices [Line Items]              
Statutory capital $ 2,100   $ 2,100       $ 2,100