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Investments, Aggregated by Type and Industry (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 236,187 $ 232,472
Gross unrealized gains 23,613 13,586
Gross unrealized losses 1,506 347
Amortized cost 214,080 219,233
Estimated fair value 15,965 22,922
Gross unrealized gains 8,655 15,754
Gross unrealized losses 1 0
Cost 7,311 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 20,461 20,259
Gross unrealized gains 1,739 467
Gross unrealized losses 25 53
Amortized cost 18,747 19,845
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 11,520 11,940
Gross unrealized gains 910 371
Gross unrealized losses 0 53
Amortized cost 10,610 11,622
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 203,956 200,023
Gross unrealized gains 20,906 12,690
Gross unrealized losses 1,481 241
Amortized cost 184,531 187,574
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 28,886 26,648
Gross unrealized gains 4,118 2,404
Gross unrealized losses 0 32
Amortized cost 24,768 24,276
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 73,151 73,917
Gross unrealized gains 6,050 4,249
Gross unrealized losses 132 57
Amortized cost 67,233 69,725
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 41,739 41,706
Gross unrealized gains 3,331 2,335
Gross unrealized losses 945 98
Amortized cost 39,353 39,469
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 60,180 57,752
Gross unrealized gains 7,407 3,702
Gross unrealized losses 404 54
Amortized cost 53,177 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 3,061 3,159
Gross unrealized gains 384 624
Gross unrealized losses 1 0
Cost 2,678 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 12,904 19,763
Gross unrealized gains 8,271 15,130
Gross unrealized losses 0 0
Cost $ 4,633 $ 4,633