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Investments, Aggregated by Type and Industry (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 247,997 $ 232,472
Gross unrealized gains 26,411 13,586
Gross unrealized losses 1,383 347
Amortized cost 222,969 219,233
Estimated fair value 14,323 22,922
Gross unrealized gains 7,926 15,754
Gross unrealized losses 3 0
Cost 6,400 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 21,039 20,259
Gross unrealized gains 1,598 467
Gross unrealized losses 21 53
Amortized cost 19,462 19,845
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 11,752 11,940
Gross unrealized gains 845 371
Gross unrealized losses 0 53
Amortized cost 10,907 11,622
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 214,956 200,023
Gross unrealized gains 23,910 12,690
Gross unrealized losses 1,362 241
Amortized cost 192,408 187,574
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 31,491 26,648
Gross unrealized gains 4,404 2,404
Gross unrealized losses 14 32
Amortized cost 27,101 24,276
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 77,366 73,917
Gross unrealized gains 7,573 4,249
Gross unrealized losses 149 57
Amortized cost 69,942 69,725
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 45,067 41,706
Gross unrealized gains 4,030 2,335
Gross unrealized losses 960 98
Amortized cost 41,997 39,469
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 61,032 57,752
Gross unrealized gains 7,903 3,702
Gross unrealized losses 239 54
Amortized cost 53,368 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 2,080 3,159
Gross unrealized gains 316 624
Gross unrealized losses 3 0
Cost 1,767 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 12,243 19,763
Gross unrealized gains 7,610 15,130
Gross unrealized losses 0 0
Cost $ 4,633 $ 4,633