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Investments, Aggregated by Industry (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments aggregated by industry [Abstract]    
Carrying value $ 210,670 $ 205,324
Cost or amortized cost 210,505 210,450
Carrying value 244,177 238,385
Cost or amortized cost 235,208 231,333
Unrealized gains (losses) 8,969 7,052
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 31,102 22,234
Cost or amortized cost 31,458 22,119
Unrealized gains (losses) (356) 115
Obligations of States and Political Subdivisions [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 17,572 25,479
Cost or amortized cost 17,255 25,410
Unrealized gains (losses) 317 69
Utilities and Telecom [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 19,635 18,975
Cost or amortized cost 17,624 17,888
Unrealized gains (losses) 2,011 1,087
Financial Services [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 62,684 59,463
Cost or amortized cost 61,141 58,167
Unrealized gains (losses) 1,543 1,296
Other Business - Diversified [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 57,663 61,158
Cost or amortized cost 58,732 66,176
Unrealized gains (losses) (1,069) (5,018)
Other Consumer - Diversified [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 42,271 41,146
Cost or amortized cost 35,748 31,643
Unrealized gains (losses) 6,523 9,503
Other Investments [Member]    
Investments aggregated by industry [Abstract]    
Carrying value 13,250 9,930
Cost or amortized cost $ 13,250 $ 9,930