Shareholders' Equity (AOCI tax effect) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Comprehensive Income, Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ 30,169	$ (11,051)	$ (5,263)
(Gain) Loss on Sale	(152)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	833	2,164	1,982
Net Unrealized Gains (Losses) on Investment Securities	(30,850)	8,887	3,281
Net Actuarial Gains (Losses) Arising During the Period	(5,046)	(4,468)	884
Amortization of Net Actuarial Losses (Gains)	1,598	1,835	1,382
Amortization of Prior Service Credit, before tax	(288)	(567)	(322)
Defined Benefit Plans, Net	(3,736)	(3,200)	1,944
Other Comprehensive Income (Loss)	27,114	(12,087)	(1,337)
Other Comprehensive Income, Tax Effect:
Net Unrealized Gains Arising During the Period	(8,001)	2,931	2,078
(Gain) Loss on Sale	(49)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	221	569	783
Net Unrealized Gains (Losses) on Investment Securities	(8,173)	2,362	1,295
Net Actuarial Gains (Losses) Arising During the Period	(1,337)	(1,184)	349
Amortization of Net Actuarial Losses (Gains)	423	460	545
Amortization of Prior Service Credit	(76)	(150)	(127)
Defined Benefit Plans, Net	(990)	(874)	767
Other Comprehensive Income (Loss)	7,183	(3,236)	(528)
Other Comprehensive Income, Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	22,168	(8,120)	(3,185)
(Gain) Loss on Sale	(103)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities after Tax	612	1,595	1,199
Net Unrealized Gains (Losses) on Investment Securities	22,677	(6,525)	(1,986)
Net Actuarial Losses Arising During the Period	(3,709)	(3,284)	535
Amortization of Net Actuarial Losses (Gains)	1,175	1,375	837
Amortization of Prior Service Credit	(212)	(417)	(195)
Defined Benefit Plans, Net	(2,746)	(2,326)	1,177
Other Comprehensive Income (Loss)	$ 19,931	$ (8,851)	$ (809)