Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Balance $ (21,823) $ (20,962) $ (20,962)
Net gain/(loss) during period 1,509 101 (861)
Other Comprehensive Income Before Reclassifications 1,653    
Amounts Reclassified From Accumulated Other Comprehensive Income (144)    
Balance (20,314)   (21,823)
Investment securities- with OTTI [Member]
      
Balance (10,036) (10,572) (10,572)
Net gain/(loss) during period     536
Other Comprehensive Income Before Reclassifications 1,070    
Amounts Reclassified From Accumulated Other Comprehensive Income (75)    
Balance (9,041)   (10,036)
Investment securities- all other [Member]
      
Balance (2,966) (2,633) (2,633)
Net gain/(loss) during period     (333)
Other Comprehensive Income Before Reclassifications (116)    
Amounts Reclassified From Accumulated Other Comprehensive Income (149)    
Balance (3,231)   (2,966)
Cash Flow Hedge (OCI) [Member]
      
Balance (507) (616) (616)
Net gain/(loss) during period     109
Other Comprehensive Income Before Reclassifications 60    
Amounts Reclassified From Accumulated Other Comprehensive Income 0    
Balance (447)   (507)
Pension Plan [Member]
      
Balance (8,262) (6,945) (6,945)
Net gain/(loss) during period     (1,317)
Other Comprehensive Income Before Reclassifications 639    
Amounts Reclassified From Accumulated Other Comprehensive Income 76    
Balance (7,547)   (8,262)
SERP [Member]
      
Balance (52) (196) (196)
Net gain/(loss) during period     144
Other Comprehensive Income Before Reclassifications 0    
Amounts Reclassified From Accumulated Other Comprehensive Income 4    
Balance $ (48)   $ (52)