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Investments, Aggregated by Type and Industry (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Securities
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Securities
Investments aggregated by type and industry [Abstract]      
Estimated fair value $ 217,149   $ 210,386
Gross unrealized gains 4,274   2,313
Gross unrealized losses 5,644   11,851
Amortized cost 218,519   219,924
Estimated fair value 25,792   20,758
Gross unrealized gains 16,732   10,243
Gross unrealized losses 0   0
Cost 9,060   10,515
Amortized cost of bonds on deposit with insurance regulatory authorities 9,477   $ 10,452
Gross OTTI losses charged to realized gains $ 0 $ 0  
Number of securities in unrealized loss position | Securities 92   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 $ 26,356   $ 27,422
Gross unrealized gains 82   36
Gross unrealized losses 723   1,061
Amortized cost 26,997   28,447
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]      
Investments aggregated by type and industry [Abstract]      
Estimated fair value 8,491   8,364
Gross unrealized gains 415   347
Gross unrealized losses 1   72
Amortized cost 8,077   8,089
Fixed Maturities [Member] | Corporate Securities [Member]      
Investments aggregated by type and industry [Abstract]      
Estimated fair value 182,110   174,408
Gross unrealized gains 3,777   1,930
Gross unrealized losses 4,920   10,718
Amortized cost 183,253   183,196
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]      
Investments aggregated by type and industry [Abstract]      
Estimated fair value 19,399   19,642
Gross unrealized gains 1,312   873
Gross unrealized losses 124   431
Amortized cost 18,211   19,200
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]      
Investments aggregated by type and industry [Abstract]      
Estimated fair value 52,583   49,477
Gross unrealized gains 1,164   747
Gross unrealized losses 1,136   2,942
Amortized cost 52,555   51,672
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]      
Investments aggregated by type and industry [Abstract]      
Estimated fair value 44,777   49,196
Gross unrealized gains 822   226
Gross unrealized losses 1,381   2,844
Amortized cost 45,336   51,814
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]      
Investments aggregated by type and industry [Abstract]      
Estimated fair value 65,351   56,093
Gross unrealized gains 479   84
Gross unrealized losses 2,279   4,501
Amortized cost 67,151   60,510
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member]      
Investments aggregated by type and industry [Abstract]      
Estimated fair value 192   192
Gross unrealized gains 0   0
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 192   192
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Amortized cost 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 4,755   4,552
Gross unrealized gains 375   172
Gross unrealized losses 0   0
Cost 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 301   306
Gross unrealized gains 254   259
Gross unrealized losses 0   0
Cost 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 20,736   14,214
Gross unrealized gains 16,103   9,090
Gross unrealized losses 0   0
Cost $ 4,633   $ 5,124