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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 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Tax (expense) benefit $ (811) $ (947) $ (2,556) $ (2,237)  
Net income 2,012 2,285 6,301 5,860 $ 7,281
Reclassification out of Accumulated Other Comprehensive Income [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net income (215) (186) (663) (699)  
Investment securities- with OTTI [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income (expense) on investment securities: taxable 55 2 112 7  
Tax (expense) benefit (22) (1) (43) (3)  
Net income 33 1 69 4  
Investment Securities -All Other AFS [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net gains/(losses) - other (27) 232 (44) 459  
Tax (expense) benefit 15 (93) 17 (183)  
Net income (12) 139 (27) 276  
Investment Securities HTM [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income (expense) on investment securities: taxable (90) (303) (262) (911)  
Tax (expense) benefit 36 121 104 364  
Net income (54) (182) (158) (547)  
Pension Plan [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Tax (expense) benefit 107 86 319 258  
Net income (160) (129) (482) (387)  
Pension Plan [Member] | Amortization of unrecognized loss [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits (264) (212) (792) (636)  
Pension Plan [Member] | Amortization of transition asset [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits 0 0 0 0  
Pension Plan [Member] | Amortization of prior service costs [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits (3) (3) (9) (9)  
SERP [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Tax (expense) benefit 14 10 43 29  
Net income (22) (15) (65) (45)  
SERP [Member] | Amortization of unrecognized loss [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits (37) (20) (110) (59)  
SERP [Member] | Amortization of prior service costs [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits $ 1 $ (5) $ 2 $ (15)