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Investments, Aggregated by Type and Industry (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Securities
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Securities
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Securities
Investments aggregated by type and industry [Abstract]          
Estimated fair value $ 223,275   $ 223,275   $ 210,386
Gross unrealized gains 8,696   8,696   2,313
Gross unrealized losses 2,712   2,712   11,851
Amortized cost 217,291   217,291   219,924
Estimated fair value 20,455   20,455   20,758
Gross unrealized gains 11,395   11,395   10,243
Gross unrealized losses 0   0   0
Cost 9,060   9,060   10,515
Amortized cost of bonds on deposit with insurance regulatory authorities 10,444   10,444   $ 10,452
Gross OTTI losses charged to realized gains $ 0 $ 0 $ 0 $ 0  
Number of securities in unrealized loss position | Securities 33   33   140
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 $ 27,929   $ 27,929   $ 27,422
Gross unrealized gains 560   560   36
Gross unrealized losses 329   329   1,061
Amortized cost 27,698   27,698   28,447
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 4,999   4,999   8,364
Gross unrealized gains 420   420   347
Gross unrealized losses 0   0   72
Amortized cost 4,579   4,579   8,089
Fixed Maturities [Member] | Corporate Securities [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 190,155   190,155   174,408
Gross unrealized gains 7,716   7,716   1,930
Gross unrealized losses 2,383   2,383   10,718
Amortized cost 184,822   184,822   183,196
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 17,482   17,482   19,642
Gross unrealized gains 1,654   1,654   873
Gross unrealized losses 0   0   431
Amortized cost 15,828   15,828   19,200
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 61,103   61,103   49,477
Gross unrealized gains 2,506   2,506   747
Gross unrealized losses 474   474   2,942
Amortized cost 59,071   59,071   51,672
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 43,516   43,516   49,196
Gross unrealized gains 1,667   1,667   226
Gross unrealized losses 658   658   2,844
Amortized cost 42,507   42,507   51,814
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 68,054   68,054   56,093
Gross unrealized gains 1,889   1,889   84
Gross unrealized losses 1,251   1,251   4,501
Amortized cost 67,416   67,416   60,510
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 192   192   192
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Amortized cost 192   192   192
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member] | Other Consumer - Diversified [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 192   192   192
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Amortized cost 192   192   192
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Utilities and Telecom [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value         1,686
Gross unrealized gains         722
Gross unrealized losses         0
Cost         964
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Financial Services [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 4,799   4,799   4,552
Gross unrealized gains 419   419   172
Gross unrealized losses 0   0   0
Cost 4,380   4,380   4,380
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Business - Diversified [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 318   318   306
Gross unrealized gains 271   271   259
Gross unrealized losses 0   0   0
Cost 47   47   47
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Consumer - Diversified [Member]          
Investments aggregated by type and industry [Abstract]          
Estimated fair value 15,338   15,338   14,214
Gross unrealized gains 10,705   10,705   9,090
Gross unrealized losses 0   0   0
Cost $ 4,633   $ 4,633   $ 5,124