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Investments, Aggregated by Type and Industry (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 257,011 $ 254,106
Gross unrealized gains 24,535 31,739
Gross unrealized losses 498 94
Amortized cost total 232,974 222,461
Estimated fair value 22,688 18,716
Gross unrealized gains 17,781 12,323
Gross unrealized losses 0 0
Cost 4,907 6,393
Amortized cost of bonds on deposit with insurance regulatory authorities 10,923 10,670
Amortized cost pledged as collateral to FHLB 5,898 1,997
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 42,235 30,762
Gross unrealized gains 837 1,381
Gross unrealized losses 195 26
Amortized cost total 41,593 29,407
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 11,760 11,802
Gross unrealized gains 862 898
Gross unrealized losses 0 0
Amortized cost total 10,898 10,904
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 202,766 211,292
Gross unrealized gains 22,778 29,402
Gross unrealized losses 303 68
Amortized cost total 180,291 181,958
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 30,439 30,359
Gross unrealized gains 3,098 4,423
Gross unrealized losses 27 0
Amortized cost total 27,368 25,936
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 73,138 78,258
Gross unrealized gains 7,509 9,811
Gross unrealized losses 65 6
Amortized cost total 65,694 68,453
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 40,429 41,145
Gross unrealized gains 4,833 5,689
Gross unrealized losses 110 15
Amortized cost total 35,706 35,471
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 58,760 61,530
Gross unrealized gains 7,338 9,479
Gross unrealized losses 101 47
Amortized cost total 51,523 52,098
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 total 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 total 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 754 2,111
Gross unrealized gains 480 351
Gross unrealized losses 0 0
Cost 274 1,760
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 21,934 16,605
Gross unrealized gains 17,301 11,972
Gross unrealized losses 0 0
Cost $ 4,633 $ 4,633