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Investments, Aggregated by Industry (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Investments aggregated by industry [Abstract]    
Carrying value $ 208,477 $ 210,670
Cost or amortized cost 205,923 210,505
Carrying value 240,664 244,177
Cost or amortized cost 229,555 235,208
Unrealized gains (losses) 11,109 8,969
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 31,131 31,102
Cost or amortized cost 31,275 31,458
Unrealized gains (losses) (144) (356)
Obligations of States and Political Subdivisions [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 17,907 17,572
Cost or amortized cost 17,246 17,255
Unrealized gains (losses) 661 317
Utilities and Telecom [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 21,575 19,635
Cost or amortized cost 19,590 17,624
Unrealized gains (losses) 1,985 2,011
Financial Services [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 57,541 62,684
Cost or amortized cost 54,891 61,141
Unrealized gains (losses) 2,650 1,543
Other Business - Diversified [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 42,992 57,663
Cost or amortized cost 43,618 58,732
Unrealized gains (losses) (626) (1,069)
Other Consumer - Diversified [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 56,804 42,271
Cost or amortized cost 50,221 35,748
Unrealized gains (losses) 6,583 6,523
Other Investment [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 12,714 13,250
Cost or amortized cost 12,714 13,250
Unrealized gains (losses) $ 0 $ 0