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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Net unrealized gains (losses), before tax	$ (12,302)		$ 6,457		$ (25,398)	$ 540
Net unrealized tax (expense) benefit	3,293		(1,727)		6,796	(145)
Other comprehensive loss, net of tax	(9,009)	$ (9,593)	4,730	$ (4,335)	(18,602)	395
Pension [Member]
Unrealized holding (losses)/gains on investments	(6,922)		1,280
Net unrealized gains (losses), before tax	(6,643)		1,652
Unrealized tax (expense) benefit	1,853		(342)
Net unrealized tax (expense) benefit	1,778		(442)
Unrealized net gains (losses), net of tax	(5,069)		938
Other comprehensive loss, net of tax	(4,865)		1,210
SERP [Member]
Net unrealized gains (losses), before tax	67
Net unrealized tax (expense) benefit	(18)
Other comprehensive loss, net of tax	49
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	75		100
Recognized gains (losses), net of tax	(204)		(272)
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member]
Recognized gains (losses), before tax	(67)		(73)
Recognized tax (expense) benefit	18		18
Recognized gains (losses), net of tax	(49)		(55)
Accumulated Other Comprehensive Loss [Member]
Unrealized net gains (losses), net of tax	(9,393)	(9,877)					$ 409
Recognized gains (losses), net of tax	(384)	(284)					(1,140)
Other comprehensive loss, net of tax	(9,009)	(9,593)	4,730	$ (4,335)
Investment securities- with OTTI [Member]
Unrealized holding (losses)/gains on investments	(795)		2,160		(654)	2,523
Recognized gains (losses), before tax	51		51		101	101
Net unrealized gains (losses), before tax	(846)		2,109		(755)	2,422
Unrealized tax (expense) benefit	213		(579)		175	(676)
Net unrealized tax (expense) benefit	227		(565)		202	(649)
Unrealized net gains (losses), net of tax	(582)	103	1,581		(479)	1,847	2,475
Recognized gains (losses), net of tax	37	37					147
Other comprehensive loss, net of tax	(619)		1,544		(553)	1,773
Investment securities- with OTTI [Member] | Accretable Yield in Income [Member]
Recognized gains (losses), before tax					101	101
Recognized tax (expense) benefit					(27)	(27)
Recognized gains (losses), net of tax					74	74
Investment securities- with OTTI [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Accretable Yield in Income [Member]
Recognized gains (losses), before tax	51		51
Recognized tax (expense) benefit	(14)		(14)
Recognized gains (losses), net of tax	37		37
Investment securities- all other [Member]
Unrealized holding (losses)/gains on investments	(5,359)		2,778		(16,203)	(4,327)
Recognized gains (losses), before tax			154		3	154
Net unrealized gains (losses), before tax	(5,359)		2,624		(7,878)	(4,481)
Unrealized tax (expense) benefit	1,435		(744)		4,336	1,159
Net unrealized tax (expense) benefit	1,435		(703)		2,109	1,200
Unrealized net gains (losses), net of tax	(3,924)		2,034		(11,867)	(3,168)
Other comprehensive loss, net of tax	(3,924)		1,921		(5,769)	(3,281)
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- all other [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Recognition of Gains (Losses) In Income [Member]
Recognized gains (losses), before tax			154
Recognized tax (expense) benefit			(41)
Recognized gains (losses), net of tax			113
Investment Securities HTM [Member]
Recognized gains (losses), before tax	(230)		(46)		(324)	(108)
Net unrealized gains (losses), before tax	230		46		(8,004)	108
Net unrealized tax (expense) benefit	(62)		(12)		2,141	(29)
Unrealized net gains (losses), net of tax		(6,100)
Recognized gains (losses), net of tax	(168)	(69)					(181)
Other comprehensive loss, net of tax	168		34		(5,863)	79
Investment Securities HTM [Member] | Amortization of Recognized Income [Member]
Recognized gains (losses), before tax					(324)	(108)
Recognized tax (expense) benefit					87	29
Recognized gains (losses), net of tax					(237)	(79)
Investment Securities HTM [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Recognized Income [Member]
Recognized gains (losses), before tax	(230)		(46)
Recognized tax (expense) benefit	62		12
Recognized gains (losses), net of tax	(168)		(34)
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	249		(47)		1,088
Net unrealized gains (losses), before tax						507
Unrealized tax (expense) benefit	(67)		13		(292)
Net unrealized tax (expense) benefit						(136)
Unrealized net gains (losses), net of tax	182	614	(34)				635
Other comprehensive loss, net of tax					796	371
Adjustment [Member]
Unrealized holding (losses)/gains on investments	(6,922)		1,280		(10,542)	1,090
Recognized gains (losses), before tax	(279)		(372)		(558)	(744)
Net unrealized gains (losses), before tax	(6,643)		1,652		(9,984)	1,834
Adjustment [Member] | Pension [Member]
Unrealized holding (losses)/gains on investments					(10,542)	1,090
Net unrealized gains (losses), before tax					(9,984)	1,834
Unrealized tax (expense) benefit					2,822	(291)
Net unrealized tax (expense) benefit					2,672	(491)
Unrealized net gains (losses), net of tax	(5,069)	(2,651)			(7,720)	799	3,431
Recognized gains (losses), net of tax	(204)	(204)					(1,091)
Other comprehensive loss, net of tax					(7,312)	1,343
Adjustment [Member] | SERP [Member]
Unrealized holding (losses)/gains on investments
Net unrealized gains (losses), before tax			73		135	150
Unrealized tax (expense) benefit
Net unrealized tax (expense) benefit			(18)		(36)	(40)
Unrealized net gains (losses), net of tax							(521)
Recognized gains (losses), net of tax	$ (49)	$ (50)					$ (128)
Other comprehensive loss, net of tax			$ 55		99	110
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member]
Recognized gains (losses), before tax					(558)	(744)
Recognized tax (expense) benefit					150	200
Recognized gains (losses), net of tax					(408)	(544)
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member]
Recognized gains (losses), before tax					(135)	(150)
Recognized tax (expense) benefit					36	40
Recognized gains (losses), net of tax					$ (99)	$ (110)

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