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Accumulated Other Comprehensive Loss (Schedule of Reclassifications From Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Tax (expense) benefit $ (840) $ (952)   $ (1,488) $ (1,745)  
Net income 3,016 2,310 $ 2,310 5,522 4,289 $ 5,269
Reclassification out of Accumulated Other Comprehensive Income [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net income (152) (196)   (412) (445)  
Investment securities- with OTTI [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Gain on calls of securities 145 0   145 0  
Interest income (expense) on investment securities: taxable 52 55   107 57  
Tax (expense) benefit (53) (22)   (68) (23)  
Net income 144 33   184 34  
Investment Securities -All Other AFS [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net gains/(losses) - other (10) (8)   (19) (17)  
Tax (expense) benefit 3 3   5 7  
Net income (7) (5)   (14) (10)  
Investment Securities HTM [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Interest income (expense) on investment securities: taxable (52) (71)   (114) (172)  
Tax (expense) benefit 14 28   31 68  
Net income (38) (43)   (83) (104)  
Pension Plan [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Tax (expense) benefit 81 107   163 212  
Net income (221) (160)   (441) (322)  
Pension Plan [Member] | Amortization of unrecognized loss [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and employee benefits (300) (264)   (600) (528)  
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)   (4) (6)  
SERP [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Tax (expense) benefit 11 15   22 29  
Net income (30) (21)   (58) (43)  
SERP [Member] | Amortization of unrecognized loss [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and employee benefits (41) (36)   (81) (73)  
SERP [Member] | Amortization of prior service costs [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and employee benefits $ 0 $ 0   $ 1 $ 1