Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Net unrealized gains (losses), before tax	$ 7,402			$ (4,523)			$ 7,086	$ (5,957)
Income tax (credit)/expense related to other comprehensive income	(1,955)			1,060			(1,872)	1,410
Other comprehensive income/(loss), net of tax	5,447	$ (1,338)	$ 1,105	(3,463)	$ (1,153)	$ 69	5,214	(4,547)
Accumulated Other Comprehensive Loss
Unrealized net gains (losses), net of tax	5,174	(1,595)	846	(3,748)	(1,435)	(210)
Recognized gains (losses), net of tax	(273)	(257)	(259)	(285)	(282)	(279)
Other comprehensive income/(loss), net of tax	5,447	(1,338)	1,105	(3,463)	(1,153)	69
Investment securities- with OTTI [Member]
Unrealized holding (losses)/gains on investments	740			633			103	(777)
Recognized gains (losses), before tax	51			51			152	152
Net unrealized gains (losses), before tax	689			582			(49)	(929)
Unrealized tax (expense) benefit				(158)			(24)	183
Income tax (credit)/expense related to other comprehensive income	(183)			(145)			13	220
Unrealized net gains (losses), net of tax	544	(620)	155	475	111	(1,180)	79	(594)
Recognized gains (losses), net of tax	38	40	37	38	40	37
Other comprehensive income/(loss), net of tax	506			437			(36)	(709)
Investment securities- with OTTI [Member] | Accretable Yield in Income [Member]
Unrealized holding (losses)/gains on investments	740
Recognized gains (losses), before tax	51			51			152
Unrealized tax (expense) benefit	(196)
Recognized tax (expense) benefit	(13)			(13)			(37)
Unrealized net gains (losses), net of tax	544
Recognized gains (losses), net of tax	38			38			115
Investment securities- with OTTI [Member] | Amortization of Recognized Income [Member]
Recognized gains (losses), before tax								152
Recognized tax (expense) benefit								(37)
Recognized gains (losses), net of tax								115
Investment securities- all other [Member]
Unrealized holding (losses)/gains on investments	3,384			(4,183)			2,044	(5,065)
Net unrealized gains (losses), before tax	3,384			(4,183)			2,044	(5,065)
Unrealized tax (expense) benefit	(893)			982				1,195
Income tax (credit)/expense related to other comprehensive income							(540)
Unrealized net gains (losses), net of tax	2,491			(3,201)				(3,870)
Other comprehensive income/(loss), net of tax							1,504
Investment Securities HTM [Member]
Recognized gains (losses), before tax	(182)			(167)			(503)	(513)
Net unrealized gains (losses), before tax	182			167			503	513
Income tax (credit)/expense related to other comprehensive income	(48)			(37)			(133)	(121)
Recognized gains (losses), net of tax	(134)	(118)	(118)	(130)	(129)	(133)
Other comprehensive income/(loss), net of tax	134			130			370	392
Investment Securities HTM [Member] | Amortization of Recognized Income [Member]
Recognized gains (losses), before tax	(182)			(167)			(503)	(513)
Recognized tax (expense) benefit	48			37			133	121
Recognized gains (losses), net of tax	(134)			(130)			(370)	(392)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Unrealized holding (losses)/gains on investments				14
Net unrealized gains (losses), before tax	(323)						(319)	30
Unrealized tax (expense) benefit	85			(3)
Income tax (credit)/expense related to other comprehensive income							84	(7)
Unrealized net gains (losses), net of tax	(238)	(51)	54	11	150	(138)
Other comprehensive income/(loss), net of tax							(235)	23
Net Pension Plan
Unrealized holding (losses)/gains on investments	3,229			(1,352)			4,181	(1,250)
Recognized gains (losses), before tax	(202)			(251)			(608)	(750)
Net unrealized gains (losses), before tax	3,431			(1,101)			4,789	(500)
Net Pension Plan | Pension
Unrealized holding (losses)/gains on investments	3,229			(1,352)			4,181	(1,250)
Net unrealized gains (losses), before tax	3,431			(1,101)			4,789	(500)
Unrealized tax (expense) benefit	(852)			319			(1,104)	298
Income tax (credit)/expense related to other comprehensive income	(906)			262			(1,265)	121
Unrealized net gains (losses), net of tax	2,377	(396)	1,096	(1,033)	(42)	123	3,077	(952)
Recognized gains (losses), net of tax	(148)	(150)	(149)	(194)	(195)	(184)
Other comprehensive income/(loss), net of tax	2,525			(839)			3,524	(379)
Net Pension Plan | SERP
Net unrealized gains (losses), before tax	39			(2)			118	(6)
Recognized tax (expense) benefit	(10)
Income tax (credit)/expense related to other comprehensive income				1			(31)	2
Recognized gains (losses), net of tax	(29)	$ (29)	$ (29)	1	$ 2	$ 1
Other comprehensive income/(loss), net of tax	29			(1)			87	(4)
Net Pension Plan | Amortization of Unrecognized Loss [Member] | Pension
Recognized gains (losses), before tax	(202)			(251)			(608)	(750)
Recognized tax (expense) benefit	54			57			161	177
Recognized gains (losses), net of tax	(148)			(194)			(447)	(573)
Net Pension Plan | Amortization of Unrecognized Loss [Member] | SERP
Recognized gains (losses), before tax				2			(118)
Recognized tax (expense) benefit				(1)			31
Recognized gains (losses), net of tax				$ 1			$ (87)
Net Pension Plan | Amortization of Unrecognized Gain [Member] | SERP
Recognized gains (losses), before tax								6
Recognized tax (expense) benefit								(2)
Recognized gains (losses), net of tax								$ 4
Net Pension Plan | Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Unrecognized Loss [Member] | SERP
Recognized gains (losses), before tax	(39)
Recognized tax (expense) benefit	10
Recognized gains (losses), net of tax	$ (29)