Accumulated Other Comprehensive Income (Loss) (AOCI Components Pre Post & Tax Effect) (Details 1) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Comprehensive Income (Loss), Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ 10,393		$ 21,812		$ 66,949	$ 30,764
(Gain) Loss on sale, before tax			127		77	63
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	121		368		186	764
Net Unrealized Gains (Losses) on Investment Securities	10,514		22,053		67,058	31,465
Amortization of Net Actuarial Losses (Gains)	571		406		1,141	812
Amortization of Prior Service Credit	(62)		(72)		(123)	(144)
Defined Benefit Plans, Net	509		334		1,018	668
Other Comprehensive Income (Loss)	11,023		22,387		68,076	32,133
Other Comprehensive Income (Loss), Tax Effect:
Net Unrealized Gains (Losses) Arising During the Period	2,752		5,782		17,741	8,153
(Gain) Loss on sale, Tax Effect			34		21	17
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	32		96		49	201
Net Unrealized Gains (Losses) on Investment Securities	2,784		5,844		17,769	8,337
Amortization of Net Actuarial Losses (Gains)	151		108		303	215
Amortization of Prior Service Credit	(16)		(19)		(33)	(38)
Defined Benefit Plans, Net	135		89		270	177
Other Comprehensive Income (Loss)	2,919		5,933		18,039	8,514
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	7,641		16,030		49,208	22,611
(Gain) Loss on sale, Net of Tax			93		56	46
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	89		272		137	563
Net Unrealized Gains (Losses) on Investment Securities	7,730		16,209		49,289	23,128
Amortization of Net Actuarial Losses (Gains)	420		298		838	597
Amortization of Prior Service Credit	(46)		(53)		(90)	(106)
Defined Benefit Plans, Net	374		245		748	491
Total Other Comprehensive Income (Loss)	$ 8,104	$ 41,933	$ 16,454	$ 7,165	$ 50,037	$ 23,619