Comprehensive Income Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for Income Taxes	$ 11,215	$ 10,610	$ 10,174
Net Income (Loss) Available to Common Stockholders, Basic	(441)	(402)	(168)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	(22)	129	110
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(22)	129	110
Provision for Income Taxes	9	(51)	(43)
Net Income (Loss) Available to Common Stockholders, Basic	(13)	78	67
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	12	56	87
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	(716)	(846)	(474)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(704)	(790)	(387)
Provision for Income Taxes	276	310	152
Net Income (Loss) Available to Common Stockholders, Basic	$ (428)	$ (480)	$ (235)