Regulatory Information (Tables)
12 Months Ended
Dec. 31, 2019
Insurance [Abstract]  
Schedule of Combined Statutory Net Gain (Loss), Statutory Surplus, Contingency Reserve and RTC Ratios
NMIC and Re One's combined statutory net gain (loss), statutory surplus, contingency reserve and risk-to-capital (RTC) ratios as of and for the years ended December 31, 2019, 2018 and 2017 were as follows:
 
As of and for the year ended December 31,
 
2019
 
2018
 
2017
 
(In Thousands)
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
15.8:1

 
13.1:1

 
13.2:1