Investments, Aggregated by Industry (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investments aggregated by industry [Abstract]
Carrying value	$ 214,749	$ 205,324
Amortized cost	207,055	210,450
Carrying value	248,951	238,385
Amortized cost	232,756	231,333
Unrealized gains (losses)	16,195	7,052
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]
Investments aggregated by industry [Abstract]
Carrying value	26,823	22,234
Amortized cost	26,445	22,119
Unrealized gains (losses)	378	115
Obligations of States and Political Subdivisions [Member]
Investments aggregated by industry [Abstract]
Carrying value	18,491	25,479
Amortized cost	17,259	25,410
Unrealized gains (losses)	1,232	69
Utilities and Telecom [Member]
Investments aggregated by industry [Abstract]
Carrying value	19,528	18,975
Amortized cost	16,628	17,888
Unrealized gains (losses)	2,900	1,087
Financial Services [Member]
Investments aggregated by industry [Abstract]
Carrying value	65,429	59,463
Amortized cost	62,173	58,167
Unrealized gains (losses)	3,256	1,296
Other Business - Diversified [Member]
Investments aggregated by industry [Abstract]
Carrying value	63,514	61,158
Amortized cost	62,748	66,176
Unrealized gains (losses)	766	(5,018)
Other Consumer - Diversified [Member]
Investments aggregated by industry [Abstract]
Carrying value	40,918	41,146
Amortized cost	33,255	31,643
Unrealized gains (losses)	7,663	9,503
Other Investment [Member]
Investments aggregated by industry [Abstract]
Carrying value	14,248	9,930
Amortized cost	$ 14,248	$ 9,930

Amount of other investments securities categorized neither as held-to-maturity nor trading.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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