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Investments, Aggregated by Type and Industry (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Securities
Issuer
Dec. 31, 2017
USD ($)
Securities
Investments aggregated by type and industry [Abstract]    
Carrying value $ 217,848 $ 215,108
Gross unrealized gains 3,976 6,485
Gross unrealized losses 8,556 3,921
Cost or amortized cost 222,428 212,544
Carrying value 18,936 23,355
Gross unrealized gains 8,018 12,437
Gross unrealized losses 0 0
Cost or amortized cost 10,918 10,918
Other invested assets 5,663 5,626
Other invested assets, cost or amortized cost 5,663 5,626
Policy loans 2,105 2,146
Policy loans, cost or amortized cost 2,105 2,146
Real estate 38 38
Real estate, cost or amortized cost 38 38
Investment in unconsolidated trusts 1,238 1,238
Investment in unconsolidated trusts, cost or amortized cost 1,238 1,238
Total investments 245,828 247,511
Total investments, gross unrealized gains 11,994 18,922
Total investments, gross unrealized losses 8,556 3,921
Total investments, cost or amortized cost 242,390 232,510
Amortized cost of bonds on deposit with insurance regulatory authorities $ 11,209 $ 11,178
Number of securities in unrealized loss position | Securities 121 69
Oil and Gas Properties [Member]    
Investments aggregated by type and industry [Abstract]    
Gross unrealized losses $ 987  
Fixed maturity investments, number of issuers | Issuer 5  
Fixed Maturities - U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value $ 29,978 $ 31,155
Gross unrealized gains 87 149
Gross unrealized losses 966 511
Cost or amortized cost 30,857 31,517
Fixed Maturities - Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 10,666 10,809
Gross unrealized gains 476 630
Gross unrealized losses 50 1
Cost or amortized cost 10,240 10,180
Fixed Maturities - Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 177,012 172,952
Gross unrealized gains 3,413 5,706
Gross unrealized losses 7,540 3,409
Cost or amortized cost 181,139 170,655
Fixed Maturities - Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 18,592 21,882
Gross unrealized gains 1,262 1,709
Gross unrealized losses 487 130
Cost or amortized cost 17,817 20,303
Fixed Maturities - Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 54,061 53,686
Gross unrealized gains 1,394 2,049
Gross unrealized losses 1,412 453
Cost or amortized cost 54,079 52,090
Fixed Maturities - Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 49,639 44,184
Gross unrealized gains 491 1,024
Gross unrealized losses 2,366 1,349
Cost or amortized cost 51,514 44,509
Fixed Maturities - Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 54,720 53,200
Gross unrealized gains 266 924
Gross unrealized losses 3,275 1,477
Cost or amortized cost 57,729 53,753
Fixed Maturities - Redeemable Preferred Stocks [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 192 192
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Cost or amortized cost 192 192
Fixed Maturities - Other Consumer Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 192 192
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Cost or amortized cost 192 192
Equity Securities - Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 1,434 1,588
Gross unrealized gains 470 624
Gross unrealized losses 0 0
Cost or amortized cost 964 964
Equity Securities - Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 5,500 5,634
Gross unrealized gains 716 851
Gross unrealized losses 0 0
Cost or amortized cost 4,784 4,783
Equity Securities - Other Business Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 299 297
Gross unrealized gains 252 250
Gross unrealized losses 0 0
Cost or amortized cost 47 47
Equity Securities - Other Consumer Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 11,703 15,836
Gross unrealized gains 6,580 10,712
Gross unrealized losses 0 0
Cost or amortized cost $ 5,123 $ 5,124