Regulatory Information - Schedule of Combined Statutory Net Loss, Statutory Surplus, Contingency Reserve and RTC Ratios (Details) - NMIC and Re One Combined $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
|
| Statutory Accounting Practices [Line Items] | |||
| Statutory net gain (loss) | $ 15,233 | $ (19,784) | $ (35,946) |
| Statutory surplus | 449,602 | 430,785 | 371,084 |
| Contingency reserve | $ 531,825 | $ 332,702 | $ 186,641 |
| Risk-to-capital | 15.8 | 13.1 | 13.2 |