• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost $ 235,830 $ 167,231
Equity securities, Cost or Amortized Cost 53,132 47,750
Total available-for-sale securities, Cost or Amortized Cost 288,962 214,981
Total available-for-sale securities, Gross Unrealized Gain 3,124 1,422
Total available-for-sale securities, Gross Unrealized Gain 6,280 5,769
Total available-for-sale securities, Gross Unrealized Gain 9,404 7,191
Total available-for-sale securities, Gross Unrealized Loss (1,470) (2,405)
Total available-for-sale securities, Gross Unrealized Loss (501) (484)
Total available-for-sale securities, Gross Unrealized Loss (1,971) (2,889)
Fixed-maturity securities, Estimated Fair Value 237,484 166,248
Equity securities, Estimated Fair Value 58,911 53,035
Total available-for-sale securities, Estimated Fair Value 296,395 219,283
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 42,313 1,975
Total available-for-sale securities, Gross Unrealized Gain 1  
Total available-for-sale securities, Gross Unrealized Loss (287) (36)
Fixed-maturity securities, Estimated Fair Value 42,027 1,939
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 106,897 75,538
Total available-for-sale securities, Gross Unrealized Gain 1,110 607
Total available-for-sale securities, Gross Unrealized Loss (904) (1,641)
Fixed-maturity securities, Estimated Fair Value 107,103 74,504
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 78,954 78,018
Total available-for-sale securities, Gross Unrealized Gain 1,816 776
Total available-for-sale securities, Gross Unrealized Loss (75) (488)
Fixed-maturity securities, Estimated Fair Value 80,695 78,306
Fixed-Maturity Securities [Member] | Exchange-Traded Debt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 7,666 11,463
Total available-for-sale securities, Gross Unrealized Gain 197 36
Total available-for-sale securities, Gross Unrealized Loss (204) (237)
Fixed-maturity securities, Estimated Fair Value $ 7,659 11,262
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost   237
Total available-for-sale securities, Gross Unrealized Gain   3
Total available-for-sale securities, Gross Unrealized Loss   (3)
Fixed-maturity securities, Estimated Fair Value   $ 237