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Accumulated Other Comprehensive Loss (Schedule of Reclassifications From Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Net gains/(losses) - other $ 9       $ (11)     $ 190 $ 3
Tax (expense) benefit (739)       (811)     (2,227) (2,556)
Net income 2,763 $ 3,016 $ 2,506 $ (1,032) 2,012 $ 2,309 $ 1,980 8,285 6,301
Reclassification out of Accumulated Other Comprehensive Income [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Net income (280)       (215)     (691) (663)
Investment securities- with OTTI [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Gain on calls of securities               145 0
Interest income (expense) on investment securities: taxable 53       55     160 112
Tax (expense) benefit (14)       (22)     (82) (43)
Net income 39       33     223 69
Investment Securities -All Other AFS [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Net gains/(losses) - other (10)       (27)     (29) (44)
Tax (expense) benefit 3       15     8 17
Net income (7)       (12)     (21) (27)
Investment Securities HTM [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Interest income (expense) on investment securities: taxable (86)       (90)     (200) (262)
Tax (expense) benefit 23       36     54 104
Net income (63)       (54)     (146) (158)
Pension Plan [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Tax (expense) benefit 82       107     246 319
Net income (220)       (160)     (660) (482)
Pension Plan [Member] | Amortization of unrecognized loss [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Salaries and employee benefits (300)       (264)     (900) (792)
Pension Plan [Member] | Amortization of prior service costs [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Salaries and employee benefits (2)       (3)     (6) (9)
SERP [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Tax (expense) benefit 10       14     32 43
Net income (29)       (22)     (87) (65)
SERP [Member] | Amortization of unrecognized loss [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Salaries and employee benefits (40)       (37)     (121) (110)
SERP [Member] | Amortization of prior service costs [Member]                  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                  
Salaries and employee benefits $ 1       $ 1     $ 2 $ 2