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Accumulated Other Comprehensive Loss (Changes in Each Component of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Loss [Line Items]    
Balance at December 31, 2012 $ (5,379)  
Other comprehensive income (loss) before reclassifications (217)  
Amounts reclassified from accumulated other comprehensive loss 173  
Net current period other comprehensive loss (44) (306)
Balance at March 31, 2013 (5,423)  
Net Unrealized Gains and Losses on Investment Securities [Member]
    
Accumulated Other Comprehensive Loss [Line Items]    
Balance at December 31, 2012 4,141  
Other comprehensive income (loss) before reclassifications (320)  
Amounts reclassified from accumulated other comprehensive loss (47)  
Net current period other comprehensive loss (367)  
Balance at March 31, 2013 3,774  
Defined Benefit Pension Items [Member]
    
Accumulated Other Comprehensive Loss [Line Items]    
Balance at December 31, 2012 (9,520)  
Other comprehensive income (loss) before reclassifications 103  
Amounts reclassified from accumulated other comprehensive loss 220  
Net current period other comprehensive loss 323  
Balance at March 31, 2013 $ (9,197)