Accumulated Other Comprehensive Loss (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income on taxable investment securities	$ 880			$ 960			$ 2,864	$ 3,612
Provision for income tax expense	(1,412)			(1,396)			(4,047)	(2,629)
Net income	4,388	$ 4,403	$ 3,430	4,960	$ 2,570	$ 1,755	12,221	9,285
Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(322)			108			(868)	(870)
Investment securities- with OTTI [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income tax expense	(13)			(13)			(40)	(40)
Net income	37			37			111	111
Investment securities- with OTTI [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Accretable Yield in Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income on taxable investment securities	50			50			151	151
Investment securities- all other [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income tax expense				(154)			(41)	(167)
Net income				421			113	455
Investment securities- all other [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Recognition of Gains (Losses) In Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains				575			154	622
Investment securities HTM [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains	(54)
Provision for income tax expense	11			20			40	201
Net income	(31)			(54)			(110)	(548)
Investment securities HTM [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income on taxable investment securities	12			(74)			(96)	(809)
Investment securities HTM [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Recognized Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains							(54)	60
Defined Benefit Plans Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Pension [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income tax expense	99			96			299	288
Net income	(273)			(262)			(817)	(786)
Defined Benefit Plans Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | SERP [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income tax expense	20			12			60	37
Net income	(55)			(34)			(165)	(102)
Defined Benefit Plans Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	(372)			(358)			(1,116)	(1,074)
Defined Benefit Plans Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	(76)			(47)			(226)	(141)
Defined Benefit Plans Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Prior Service Costs [Member] | SERP [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	$ 1			$ 1			$ 1	$ 2