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Investments, Aggregated by Type and Industry (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 213,696 $ 232,472
Gross unrealized gains 10,249 13,586
Gross unrealized losses 8,139 347
Amortized cost 211,586 219,233
Estimated fair value 14,467 22,922
Gross unrealized gains 7,301 15,754
Gross unrealized losses 2 0
Cost 7,168 7,168
Amortized cost of bonds on deposit with insurance regulatory authorities 10,444 10,669
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 20,723 20,259
Gross unrealized gains 1,529 467
Gross unrealized losses 61 53
Amortized cost 19,255 19,845
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 11,009 11,940
Gross unrealized gains 406 371
Gross unrealized losses 10 53
Amortized cost 10,613 11,622
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 181,714 200,023
Gross unrealized gains 8,256 12,690
Gross unrealized losses 8,068 241
Amortized cost 181,526 187,574
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 26,797 26,648
Gross unrealized gains 2,328 2,404
Gross unrealized losses 303 32
Amortized cost 24,772 24,276
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 65,655 73,917
Gross unrealized gains 1,899 4,249
Gross unrealized losses 2,342 57
Amortized cost 66,098 69,725
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 36,186 41,706
Gross unrealized gains 1,512 2,335
Gross unrealized losses 3,797 98
Amortized cost 38,471 39,469
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 53,076 57,752
Gross unrealized gains 2,517 3,702
Gross unrealized losses 1,626 54
Amortized cost 52,185 54,104
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 250 250
Gross unrealized gains 58 58
Gross unrealized losses 0 0
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 250 250
Gross unrealized gains 58 58
Gross unrealized losses 0 0
Amortized cost 192 192
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 2,871 3,159
Gross unrealized gains 338 624
Gross unrealized losses 2 0
Cost 2,535 2,535
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 11,596 19,763
Gross unrealized gains 6,963 15,130
Gross unrealized losses 0 0
Cost $ 4,633 $ 4,633