Accumulated Other Comprehensive Income (Loss) (AOCI Components Pre Post & Tax Effect) (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income (Loss), Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ 4,642	$ 8,279	$ 12,222	$ 22,223
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	491	242	995	663
Net Unrealized Gains (Losses) on Investment Securities	5,133	8,521	13,217	22,886
Amortization of Net Actuarial Losses (Gains)	322	312	645	626
Amortization of Prior Service Credit	(80)	(80)	(161)	(161)
Defined Benefit Plans, Net	242	232	484	465
Other Comprehensive Income (Loss)	5,375	8,753	13,701	23,351
Other Comprehensive Income (Loss), Tax Effect:
Net Unrealized Gains (Losses) Arising During the Period	1,833	3,268	4,824	8,773
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	194	96	393	262
Net Unrealized Gains (Losses) on Investment Securities	2,027	3,364	5,217	9,035
Amortization of Net Actuarial Losses (Gains)	127	123	255	247
Amortization of Prior Service Credit	(32)	(32)	(64)	(64)
Defined Benefit Plans, Net	95	91	191	183
Other Comprehensive Income (Loss)	2,122	3,455	5,408	9,218
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	2,809	5,011	7,398	13,450
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	297	146	602	401
Net Unrealized Gains (Losses) on Investment Securities	3,106	5,157	8,000	13,851
Amortization of Net Actuarial Losses (Gains)	195	189	390	379
Amortization of Prior Service Credit	(48)	(48)	(97)	(97)
Defined Benefit Plans, Net	147	141	293	282
Total Other Comprehensive Income	$ 3,253	$ 5,298	$ 8,293	$ 14,133