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Investments, Aggregated by Type and Industry (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 207,138 $ 215,108
Gross unrealized gains 2,479 6,485
Gross unrealized losses 11,039 3,921
Cost or amortized cost 215,698 212,544
Estimated fair value 23,705 23,355
Gross unrealized gains 13,190 12,437
Gross unrealized losses 0 0
Cost 10,515 10,918
Amortized cost of bonds on deposit with insurance regulatory authorities $ 9,896 $ 11,178
Number of securities in unrealized loss position | Securities 133 69
Fixed Maturities [Member] | U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 26,240 $ 31,155
Gross unrealized gains 7 149
Gross unrealized losses 1,449 511
Cost or amortized cost 27,682 31,517
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 8,224 10,809
Gross unrealized gains 259 630
Gross unrealized losses 135 1
Cost or amortized cost 8,100 10,180
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 172,482 172,952
Gross unrealized gains 2,213 5,706
Gross unrealized losses 9,455 3,409
Cost or amortized cost 179,724 170,655
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 18,891 21,882
Gross unrealized gains 855 1,709
Gross unrealized losses 756 130
Cost or amortized cost 18,792 20,303
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 51,517 53,686
Gross unrealized gains 1,031 2,049
Gross unrealized losses 2,142 453
Cost or amortized cost 52,628 52,090
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 47,267 44,184
Gross unrealized gains 240 1,024
Gross unrealized losses 2,668 1,349
Cost or amortized cost 49,695 44,509
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 54,807 53,200
Gross unrealized gains 87 924
Gross unrealized losses 3,889 1,477
Cost or amortized cost 58,609 53,753
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 192 192
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Cost or amortized cost 192 192
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 192 192
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Cost or amortized cost 192 192
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 1,602 1,588
Gross unrealized gains 637 624
Gross unrealized losses 0 0
Cost 965 964
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 4,770 5,634
Gross unrealized gains 390 851
Gross unrealized losses 0 0
Cost 4,380 4,783
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 320 297
Gross unrealized gains 273 250
Gross unrealized losses 0 0
Cost 47 47
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 17,013 15,836
Gross unrealized gains 11,890 10,712
Gross unrealized losses 0 0
Cost $ 5,123 $ 5,124