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, 2016
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Tax (expense) benefit $ (947)   $ (594)   $ (2,237) $ (1,351)  
Net income 2,285 $ 2,285 1,948 $ 1,948 5,860 4,491 $ 10,876
Reclassification out of Accumulated Other Comprehensive Income [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Net income (186)   (67)   (699) (274)  
Investment securities- with OTTI [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Interest income (expense) on investment securities: taxable 2   139   7 479  
Tax (expense) benefit (1)   (55)   (3) (191)  
Net income 1   84   4 288  
Investment Securities -All Other AFS [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Net gains/(losses) - other 232   79   459 62  
Tax (expense) benefit (93)   (33)   (183) (25)  
Net income 139   46   276 37  
Investment Securities HTM [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Interest income (expense) on investment securities: taxable (303)   (106)   (911) (374)  
Tax (expense) benefit 121   42   364 149  
Net income (182)   (64)   (547) (225)  
Pension Plan [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Tax (expense) benefit 86   79   258 227  
Net income (129)   (123)   (387) (343)  
Pension Plan [Member] | Amortization of unrecognized loss [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Salaries and employee benefits 212   204   636 576  
Pension Plan [Member] | Amortization of transition asset [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Salaries and employee benefits 0   (5)   0 (15)  
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 10   8   29 21  
Net income (15)   (10)   (45) (31)  
SERP [Member] | Amortization of unrecognized loss [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Salaries and employee benefits 20   13   59 37  
SERP [Member] | Amortization of prior service costs [Member]              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]              
Salaries and employee benefits $ 5   $ 5   $ 15 $ 15