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Investments, Aggregated by Type and Industry (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments aggregated by type and industry [Abstract]    
Estimated fair value $ 246,801 $ 254,106
Gross unrealized gains 18,888 31,739
Gross unrealized losses 1,111 94
Amortized cost total 229,024 222,461
Estimated fair value 17,900 18,716
Gross unrealized gains 13,067 12,323
Gross unrealized losses 0 0
Cost 4,833 6,393
Amortized cost of bonds on deposit with insurance regulatory authorities 10,444 10,670
Amortized cost pledged as collateral to FHLB 6,391 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 34,639 30,762
Gross unrealized gains 788 1,381
Gross unrealized losses 260 26
Amortized cost total 34,111 29,407
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 11,559 11,802
Gross unrealized gains 658 898
Gross unrealized losses 0 0
Amortized cost total 10,901 10,904
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 200,353 211,292
Gross unrealized gains 17,384 29,402
Gross unrealized losses 851 68
Amortized cost total 183,820 181,958
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 29,295 30,359
Gross unrealized gains 2,505 4,423
Gross unrealized losses 137 0
Amortized cost total 26,927 25,936
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 74,847 78,258
Gross unrealized gains 6,254 9,811
Gross unrealized losses 271 6
Amortized cost total 68,864 68,453
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 38,959 41,145
Gross unrealized gains 3,277 5,689
Gross unrealized losses 264 15
Amortized cost total 35,946 35,471
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Estimated fair value 57,252 61,530
Gross unrealized gains 5,348 9,479
Gross unrealized losses 179 47
Amortized cost total 52,083 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 624 2,111
Gross unrealized gains 424 351
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 17,276 16,605
Gross unrealized gains 12,643 11,972
Gross unrealized losses 0 0
Cost $ 4,633 $ 4,633