Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	$ (1,208)	$ (2,961)	$ 3,500
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	402	168	589
Other Comprehensive Income (Loss), before Tax	(1,329)	(4,547)	6,772
Other Comprehensive Income (Loss), Tax	523	1,754	(2,683)
Other Comprehensive (Loss) Income	(806)	(2,793)	4,089
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(3,017)	356	(4,843)
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit	1,185	(124)	1,918
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,832)	232	(2,925)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(129)	(110)	(540)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	51	43	214
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(78)	(67)	(326)
Other Comprehensive (Loss) Income	(1,910)	165	(3,251)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	1,395	(4,610)	10,640
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit	(547)	1,764	(4,215)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	848	(2,846)	6,425
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	846	474	1,513
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	(332)	(186)	(599)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	514	288	914
Other Comprehensive (Loss) Income	1,362	(2,558)	7,339
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(368)		0
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit	144		0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(224)	(347)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(56)	(87)	2
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	22	34	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(34)	(53)	1
Other Comprehensive (Loss) Income	$ (258)	$ (400)	$ 1