Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Net unrealized gains (losses), before tax	$ (9,447)			$ (361)			$ (34,845)	$ 179
Income tax benefit/(expense) related to other comprehensive income	2,529			97			9,325	(48)
Other comprehensive (loss)/income, net of tax	(6,918)	$ (9,009)	$ (9,593)	(264)	$ 4,730	$ (4,335)	(25,520)	131
Pension [Member]
Unrealized holding (losses)/gains on investments	(3,537)			(951)
Net unrealized gains (losses), before tax	(3,258)			(579)
Unrealized tax (expense) benefit	945			254
Income tax benefit/(expense) related to other comprehensive income	871			155
Unrealized net gains (losses), net of tax	(2,592)			(697)
Other comprehensive (loss)/income, net of tax	(2,387)			(424)
SERP [Member]
Net unrealized gains (losses), before tax	68
Income tax benefit/(expense) related to other comprehensive income	(18)
Other comprehensive (loss)/income, net of tax	50
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member]
Recognized gains (losses), before tax	(279)			(372)
Recognized tax (expense) benefit	74			99
Recognized gains (losses), net of tax	(205)			(273)
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member]
Recognized gains (losses), before tax	(68)			(76)
Recognized tax (expense) benefit	18			20
Recognized gains (losses), net of tax	(50)			(56)
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Prior Service Costs [Member] | SERP [Member]
Recognized gains (losses), before tax				1				1
Recognized gains (losses), net of tax				1				1
Accumulated Other Comprehensive Loss [Member]
Unrealized net gains (losses), net of tax	(7,303)	(9,393)	(9,877)						$ 409
Recognized gains (losses), net of tax	(385)	(384)	(284)						(1,140)
Other comprehensive (loss)/income, net of tax	(6,918)	(9,009)	(9,593)	(264)	$ 4,730	$ (4,335)
Investment securities- with OTTI [Member]
Unrealized holding (losses)/gains on investments	(199)			751			(853)	3,274
Recognized gains (losses), before tax	51			50			152	151
Net unrealized gains (losses), before tax	(250)			701			(1,005)	3,123
Unrealized tax (expense) benefit	53			(201)			228	(877)
Income tax benefit/(expense) related to other comprehensive income	67			(188)			269	(837)
Unrealized net gains (losses), net of tax	(146)	(582)	103	550			(625)	2,397	2,475
Recognized gains (losses), net of tax	37	37	37						147
Other comprehensive (loss)/income, net of tax	(183)			513			(736)	2,286
Investment securities- with OTTI [Member] | Accretable Yield in Income [Member]
Recognized gains (losses), before tax							152	151
Recognized tax (expense) benefit							(41)	(40)
Recognized gains (losses), net of tax							111	111
Investment securities- with OTTI [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Accretable Yield in Income [Member]
Recognized gains (losses), before tax	51			50
Recognized tax (expense) benefit	(14)			(13)
Recognized gains (losses), net of tax	37			37
Investment securities- all other [Member]
Unrealized holding (losses)/gains on investments	(6,768)			(708)			(22,971)	(5,035)
Recognized gains (losses), before tax							3	154
Net unrealized gains (losses), before tax	(6,768)			(708)			(14,646)	(5,189)
Unrealized tax (expense) benefit	1,811			190			6,147	1,349
Income tax benefit/(expense) related to other comprehensive income	1,811			190			3,920	1,390
Unrealized net gains (losses), net of tax	(4,957)			(518)			(16,824)	(3,686)
Other comprehensive (loss)/income, net of tax	(4,957)			(518)			(10,726)	(3,799)
Investment securities- all other [Member] | Recognition of Gains (Losses) In Income [Member]
Recognized gains (losses), before tax							3	154
Recognized tax (expense) benefit							(1)	(41)
Recognized gains (losses), net of tax							2	113
Investment Securities HTM [Member]
Recognized gains (losses), before tax	(320)			12			(644)	(96)
Net unrealized gains (losses), before tax	227			42			(7,777)	150
Income tax benefit/(expense) related to other comprehensive income	(60)			(11)			2,081	(40)
Unrealized net gains (losses), net of tax			(6,100)
Recognized gains (losses), net of tax	(167)	(168)	(69)						(181)
Other comprehensive (loss)/income, net of tax	167			31			(5,696)	110
Investment Securities HTM [Member] | Recognition of Gains (Losses) In Income [Member]
Unrealized holding (losses)/gains on investments				(54)				(54)
Recognized gains (losses), before tax	93						93
Unrealized tax (expense) benefit				14				14
Recognized tax (expense) benefit	(25)						(25)
Unrealized net gains (losses), net of tax				(40)				(40)
Recognized gains (losses), net of tax	68						68
Investment Securities HTM [Member] | Amortization of Recognized Income [Member]
Recognized gains (losses), before tax							(644)	(96)
Recognized tax (expense) benefit							172	26
Recognized gains (losses), net of tax							(472)	(70)
Investment Securities HTM [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Recognized Income [Member]
Recognized gains (losses), before tax	(320)			12
Recognized tax (expense) benefit	85			(3)
Recognized gains (losses), net of tax	(235)			9
Investment Securities Transferred From AFS to HTM [Member]
Unrealized holding (losses)/gains on investments							8,328
Unrealized tax (expense) benefit							(2,228)
Unrealized net gains (losses), net of tax							6,100
Investment Securities Transferred to HTM [Member]
Unrealized holding (losses)/gains on investments							(8,328)
Unrealized tax (expense) benefit							2,228
Unrealized net gains (losses), net of tax							(6,100)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Unrealized holding (losses)/gains on investments	534			108			1,622
Net unrealized gains (losses), before tax								615
Unrealized tax (expense) benefit	(142)			(29)			(434)
Income tax benefit/(expense) related to other comprehensive income								(165)
Unrealized net gains (losses), net of tax	392	182	614	79					635
Other comprehensive (loss)/income, net of tax							1,188	450
Adjustment [Member]
Unrealized holding (losses)/gains on investments	(3,537)			(951)			(14,079)	139
Recognized gains (losses), before tax	(279)			(372)			(837)	(1,116)
Net unrealized gains (losses), before tax	(3,258)			(579)			(13,242)	1,255
Adjustment [Member] | Pension [Member]
Unrealized holding (losses)/gains on investments							(14,079)	139
Net unrealized gains (losses), before tax							(13,242)	1,255
Unrealized tax (expense) benefit							3,767	(37)
Income tax benefit/(expense) related to other comprehensive income							3,543	(336)
Unrealized net gains (losses), net of tax	(2,592)	(5,069)	(2,651)				(10,312)	102	3,431
Recognized gains (losses), net of tax	(205)	(204)	(204)						(1,091)
Other comprehensive (loss)/income, net of tax							(9,699)	919
Adjustment [Member] | SERP [Member]
Unrealized holding (losses)/gains on investments
Net unrealized gains (losses), before tax				75			203	225
Unrealized tax (expense) benefit
Income tax benefit/(expense) related to other comprehensive income				(20)			(54)	(60)
Unrealized net gains (losses), net of tax									(521)
Recognized gains (losses), net of tax	$ (50)	$ (49)	$ (50)						$ (128)
Other comprehensive (loss)/income, net of tax				$ 55			149	165
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member]
Recognized gains (losses), before tax							(837)	(1,116)
Recognized tax (expense) benefit							224	299
Recognized gains (losses), net of tax							(613)	(817)
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member]
Recognized gains (losses), before tax							(203)	(226)
Recognized tax (expense) benefit							54	60
Recognized gains (losses), net of tax							$ (149)	$ (166)