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Investments, Aggregated by Type and Industry (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Investments aggregated by type and industry [Abstract]    
Carrying value $ 208,856 $ 215,108
Gross unrealized gains 2,861 6,485
Gross unrealized losses 11,000 3,921
Cost or amortized cost 216,995 212,544
Carrying value 23,025 23,355
Gross unrealized gains 12,107 12,437
Gross unrealized losses 0 0
Cost or amortized cost 10,918 10,918
Amortized cost of bonds on deposit with insurance regulatory authorities $ 10,647 $ 11,178
Number of securities in unrealized loss position | Securities 131 69
Fixed Maturities [Member] | U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value $ 27,776 $ 31,155
Gross unrealized gains 12 149
Gross unrealized losses 1,089 511
Cost or amortized cost 28,853 31,517
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 9,363 10,809
Gross unrealized gains 346 630
Gross unrealized losses 88 1
Cost or amortized cost 9,105 10,180
Fixed Maturities [Member] | Corporate Securities [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 171,525 172,952
Gross unrealized gains 2,503 5,706
Gross unrealized losses 9,823 3,409
Cost or amortized cost 178,845 170,655
Fixed Maturities [Member] | Corporate Securities [Member] | Utilities and Telecom [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 18,963 21,882
Gross unrealized gains 1,030 1,709
Gross unrealized losses 859 130
Cost or amortized cost 18,792 20,303
Fixed Maturities [Member] | Corporate Securities [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 51,649 53,686
Gross unrealized gains 1,070 2,049
Gross unrealized losses 2,145 453
Cost or amortized cost 52,724 52,090
Fixed Maturities [Member] | Corporate Securities [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 47,222 44,184
Gross unrealized gains 312 1,024
Gross unrealized losses 2,802 1,349
Cost or amortized cost 49,712 44,509
Fixed Maturities [Member] | Corporate Securities [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 53,691 53,200
Gross unrealized gains 91 924
Gross unrealized losses 4,017 1,477
Cost or amortized cost 57,617 53,753
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 192 192
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Cost or amortized cost 192 192
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 192 192
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Cost or 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]    
Carrying value 1,509 1,588
Gross unrealized gains 545 624
Gross unrealized losses 0 0
Cost or amortized cost 964 964
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Financial Services [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 5,553 5,634
Gross unrealized gains 769 851
Gross unrealized losses 0 0
Cost or amortized cost 4,784 4,783
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Business - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 282 297
Gross unrealized gains 235 250
Gross unrealized losses 0 0
Cost or amortized cost 47 47
Equity Securities [Member] | Common and Non-redeemable Preferred Stocks [Member] | Other Consumer - Diversified [Member]    
Investments aggregated by type and industry [Abstract]    
Carrying value 15,681 15,836
Gross unrealized gains 10,558 10,712
Gross unrealized losses 0 0
Cost or amortized cost $ 5,123 $ 5,124