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Accumulated Other Comprehensive Loss (Amounts Reclassified out of Each Component of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Unrealized gains and losses on sale of securities:    
Net realized (gains) losses on available for sale securities $ (71)  
Total before tax (71)   
Provision for income tax expense (24)   
Net of tax (47)  
Amortization of defined benefit items    
Estimated net loss 341 [1]  
Prior service cost (5) [1] (5)
Transition asset (2) [1] (4)
Total before tax 334  
Provision for income tax expense (114)  
Net of tax 220  
Total reclassifications for the period $ 173  
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 16 for additional details).