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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Unrealized gains and losses on sale of securities:        
Net realized (gains) losses on available for sale securities $ (71)   $ (71)  
Total before tax    (12) (71) (12)
Provision for income tax expense    4 24 4
Net of tax (47)   (47)  
Amortization of defined benefit items        
Estimated net loss 341 [1]   682 [1]  
Prior service cost (5) [1] (5) (10) [1] (10)
Transition asset (2) [1] (4) (4) [1] (8)
Total before tax 334   668  
Provision for income tax expense (114)   (228)  
Net of tax 220   440  
Total reclassifications for the period $ 220   $ 393  
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 16 for additional details).