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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, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Loss [Line Items]    
Beginning Balance $ (5,875) $ (5,379)
Other comprehensive income before reclassifications 598 (217)
Amounts reclassified from accumulated other comprehensive loss (37) (173) [1]
Net current period other comprehensive income 561 (44)
Ending Balance (5,314) (5,423)
Net Unrealized Gains and Losses on Investment Securities [Member]
    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning Balance 1,043 4,141
Other comprehensive income before reclassifications 339 (320)
Amounts reclassified from accumulated other comprehensive loss (37) (47)
Net current period other comprehensive income 302 (367)
Ending Balance 1,345 3,774
Defined Benefit Pension Items [Member]
    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning Balance (6,918) (9,520)
Other comprehensive income before reclassifications 259 103
Amounts reclassified from accumulated other comprehensive loss    220
Net current period other comprehensive income 259 323
Ending Balance $ (6,659) $ (9,197)
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 16 for additional details).