Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (3,421)	$ 133	$ (15,240)	$ 8,733
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	(3,700)	(33)
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	279	166
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	(3,421)	133
TOTAL Balance	(28,889)	(5,564)	(14,704)
TOTAL Balance	(32,310)	(5,431)	(32,310)	(5,431)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3,702)	(51)
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	(3,700)	(33)
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	(2)	(18)
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	(3,702)	(51)
TOTAL Balance	(9,625)	7,156
TOTAL Balance	(13,327)	7,105	(13,327)	7,105
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	281	184
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	0	0
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	281	184
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	281	184
TOTAL Balance	(19,264)	(12,720)
TOTAL Balance	$ (18,983)	$ (12,536)	$ (18,983)	$ (12,536)