Accumulated Other Comprehensive Income (Loss) (AOCI Components Pre Post & Tax Effect) (Details 1) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Comprehensive Income (Loss), Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ 21,812		$ (4,622)		$ 30,764	$ (17,679)
(Gain) Loss on Sale	127				63
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	368		578		764	1,237
Net Unrealized Gains (Losses) on Investment Securities	22,053		(4,044)		31,465	(16,442)
Amortization of Net Actuarial Losses (Gains)	406		436		812	872
Amortization of Prior Service Credit	(72)		(142)		(144)	(284)
Defined Benefit Plans, Net	334		294		668	588
Other Comprehensive Income (Loss)	22,387		(3,750)		32,133	(15,854)
Other Comprehensive Income (Loss), Tax Effect:
Net Unrealized Gains (Losses) Arising During the Period	5,782		(1,223)		8,153	(4,675)
(Gain) Loss on Sale, Tax	34				17
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	96		153		201	328
Net Unrealized Gains (Losses) on Investment Securities	5,844		(1,070)		8,337	(4,347)
Amortization of Net Actuarial Losses (Gains)	108		116		215	232
Amortization of Prior Service Credit	(19)		(38)		(38)	(76)
Defined Benefit Plans, Net	89		78		177	156
Other Comprehensive Income (Loss)	5,933		(992)		8,514	(4,191)
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	16,030		(3,399)		22,611	(13,004)
(Gain) Loss on Sale, Net of Tax	93				46
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	272		425		563	909
Net Unrealized Gains (Losses) on Investment Securities	16,209		(2,974)		23,128	(12,095)
Amortization of Net Actuarial Losses (Gains)	298		320		597	640
Amortization of Prior Service Credit	(53)		(104)		(106)	(208)
Defined Benefit Plans, Net	245		216		491	432
Total Other Comprehensive Income (Loss)	$ 16,454	$ 7,165	$ (2,758)	$ (8,905)	$ 23,619	$ (11,663)