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Investments, Aggregated by Type and Industry (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 257,808 $ 254,106
Gross unrealized gains 26,100 31,739
Gross unrealized losses 433 94
Amortized cost total 232,141 222,461
Estimated fair value 21,903 18,716
Gross unrealized gains 17,070 12,323
Gross unrealized losses 0 0
Cost 4,833 6,393
Amortized cost of bonds on deposit with insurance regulatory authorities 10,923 10,670
Amortized cost pledged as collateral to FHLB 6,394 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 37,393 30,762
Gross unrealized gains 887 1,381
Gross unrealized losses 156 26
Amortized cost total 36,662 29,407
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 11,843 11,802
Gross unrealized gains 943 898
Gross unrealized losses 0 0
Amortized cost total 10,900 10,904
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 208,322 211,292
Gross unrealized gains 24,212 29,402
Gross unrealized losses 277 68
Amortized cost total 184,387 181,958
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 30,813 30,359
Gross unrealized gains 3,363 4,423
Gross unrealized losses 29 0
Amortized cost total 27,479 25,936
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 77,409 78,258
Gross unrealized gains 8,032 9,811
Gross unrealized losses 63 6
Amortized cost total 69,440 68,453
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 40,936 41,145
Gross unrealized gains 5,094 5,689
Gross unrealized losses 89 15
Amortized cost total 35,931 35,471
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 59,164 61,530
Gross unrealized gains 7,723 9,479
Gross unrealized losses 96 47
Amortized cost total 51,537 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 681 2,111
Gross unrealized gains 481 351
Gross unrealized losses 0 0
Cost 200 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 21,222 16,605
Gross unrealized gains 16,589 11,972
Gross unrealized losses 0 0
Cost $ 4,633 $ 4,633