• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
Investments (Other-than-temporary Impairment) - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Dec. 31, 2016
USD ($)
Securities
Dec. 31, 2015
Securities
Schedule of Investments [Line Items]        
Net other-than-temporary impairment losses $ 80 $ 1,467 $ 2,482  
Impairment Loss $ 80 $ 1,116 $ 2,252  
Number of securities in an unrealized loss position | Securities 82 77    
Number of securities had been in an unrealized loss position for 12 months or longer | Securities 35 15    
Cumulative Credit Losses $ 0      
Fixed-Maturity Securities [Member]        
Schedule of Investments [Line Items]        
Other-than-temporary impairment losses, number of securities sold | Securities   4    
Other-than-temporary impairment losses, number of securities | Securities 1   4 2
Net other-than-temporary impairment losses $ 80 $ 428 $ 1,565  
Impairment Loss     1,335  
Impairment loss recorded in other comprehensive income     230  
Equity Securities [Member]        
Schedule of Investments [Line Items]        
Net other-than-temporary impairment losses   1,039 $ 917  
Two Fixed Maturities [Member]        
Schedule of Investments [Line Items]        
Fixed-maturity securities with cumulative credit losses   $ 475