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Accumulated Other Comprehensive Loss (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Interest income on taxable investment securities $ 994   $ 1,344   $ 1,984 $ 2,652
Provision for income tax expense (1,536)   (711)   (2,635) (1,233)
Net income 4,403 $ 3,430 2,570 $ 1,755 7,833 4,325
Reclassification out of Accumulated Other Comprehensive Loss [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net income (211)   (666)   (546) (978)
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 51   51   101 101
Provision for income tax expense (14)   (14)   (27) (27)
Net income 37   37   74 74
Investment securities- all other [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net gains 154   47   154 47
Provision for income tax expense (41)   (13)   (41) (13)
Net income 113   34   113 34
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 (46)   (662)   (108) (735)
Net gains     60     60
Provision for income tax expense 12   161   29 181
Net income (34)   (441)   (79) (494)
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   200 192
Net income (272)   (262)   (544) (524)
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)   (744) (716)
SERP [Member] | Amortization of Prior Service Costs [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and employee benefits           1
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 18   13   40 25
Net income (55)   (34)   (110) (68)
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 $ (73)   $ (47)   $ (150) $ (94)