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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Tax (expense) benefit $ (952) $ (613) $ (1,745) $ (1,290)  
Net income 2,309 1,704 4,289 3,575 $ 7,281
Reclassification out of Accumulated Other Comprehensive Income [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net income (196) (372) (445) (514)  
Investment securities- with OTTI [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income (expense) on investment securities: taxable 55 (31) 57 5  
Tax (expense) benefit (22) 12 (23) (2)  
Net income 33 (19) 34 3  
Investment Securities -All Other AFS [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net gains/(losses) - other (8) 21 (17) 227  
Tax (expense) benefit 3 (9) 7 (91)  
Net income (5) 12 (10) 136  
Investment Securities HTM [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income (expense) on investment securities: taxable (71) (371) (172) (608)  
Tax (expense) benefit 28 149 68 243  
Net income (43) (222) (104) (365)  
Pension Plan [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Tax (expense) benefit 107 87 212 172  
Net income (160) (128) (322) (258)  
Pension Plan [Member] | Amortization of unrecognized loss [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits (264) (212) (528) (424)  
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) (6) (6)  
SERP [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Tax (expense) benefit 15 10 29 19  
Net income (21) (15) (43) (30)  
SERP [Member] | Amortization of unrecognized loss [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits (36) (20) (73) (39)  
SERP [Member] | Amortization of prior service costs [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Salaries and employee benefits $ 0 $ (5) $ 1 $ (10)