Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 1,566	$ (6,745)	$ 5,908	$ 481
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	1,269	(7,571)	5,308	(2,810)
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	297	826	600	3,291
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	1,566	(6,745)	5,908	481
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,493)	(14,048)	(3,493)	(14,048)	$ (5,059)	$ (9,401)	$ (7,303)	$ (14,529)
TOTAL Balance	(3,493)	(14,048)	(3,493)	(14,048)
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	1,262	(7,564)	5,300	(2,802)
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	1,269	(7,571)	5,308	(2,810)
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	(7)	7	(8)	8
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	1,262	(7,564)	5,300	(2,802)
Accumulated Other Comprehensive Income (Loss), Net of Tax	14,353	7,476	14,353	7,476	13,091	9,053	15,040	10,278
TOTAL Balance	14,353	7,476	14,353	7,476
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	304	819	608	3,283
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	304	819	608	3,283
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	304	819	608	3,283
Accumulated Other Comprehensive Income (Loss), Net of Tax	(17,846)	(21,524)	(17,846)	(21,524)	$ (18,150)	$ (18,454)	$ (22,343)	$ (24,807)
TOTAL Balance	$ (17,846)	$ (21,524)	$ (17,846)	$ (21,524)