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Accumulated Other Comprehensive Loss (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest income on taxable investment securities $ 990 $ 1,308
Provision for income tax expense (1,099) (522)
Net income 3,430 1,755
Reclassification out of Accumulated Other Comprehensive Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income (335) (312)
Investment securities- with OTTI [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest income on taxable investment securities 50 50
Provision for income tax expense (13) (13)
Net income 37 37
Investment Securities HTM [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest income on taxable investment securities (61) (72)
Provision for income tax expense 16 19
Net income (45) (53)
Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Provision for income tax expense 100 96
Net income (272) (262)
Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other expense (372) (358)
SERP [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Provision for income tax expense 19 12
Net income (55) (34)
SERP [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Unrecognized Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other expense (75) (47)
SERP [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Amortization of Prior Service Costs [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Salaries and employee benefits $ 1 $ 1