Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 5,229	$ 1,566	$ 8,600	$ 5,908
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	5,055	1,269	8,244	5,308
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	174	297	356	600
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	5,229	1,566	8,600	5,908
TOTAL Balance	(10,793)	(5,059)	(14,164)	(9,401)
TOTAL Balance	(5,564)	(3,493)	(5,564)	(3,493)
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	5,045	1,262	8,233	5,300
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	5,055	1,269	8,244	5,308
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	(10)	(7)	(11)	(8)
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	5,045	1,262	8,233	5,300
TOTAL Balance	2,111	13,091	(1,077)	9,053
TOTAL Balance	7,156	14,353	7,156	14,353
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	184	304	367	608
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	0	0	0	0
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	184	304	367	608
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	184	304	367	608
TOTAL Balance	(12,904)	(18,150)	(13,087)	(18,454)
TOTAL Balance	$ (12,720)	$ (17,846)	$ (12,720)	$ (17,846)