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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Unrealized Gain (Loss) on Securities Available for Sale      
Beginning balance at January 1, 2013 $ 2,007 $ 2,376  
Other comprehensive income (loss) before reclassifications (3,239)    
Amounts reclassified from accumulated other comprehensive income       
Net current-period other comprehensive income (loss) (3,239)    
Ending balance at December 31, 2013 (1,232) 2,007 2,376
Additional Pension Asset (Liability)      
Beginning balance at January 1, 2013 (2,183) (11,058)  
Other comprehensive income (loss) before reclassifications       
Amounts reclassified from accumulated other comprehensive income 5,315    
Net current-period other comprehensive income (loss) 5,315    
Ending balance at December 31, 2013 (3,132) 2,183 11,058
Total      
Beginning balance at January 1, 2013 (176) (8,682)  
Other comprehensive income (loss) before reclassifications (3,239)    
Amounts reclassified from accumulated other comprehensive income 5,315    
Net current-period other comprehensive income (loss) 2,076 8,506 (3,597)
Ending balance at December 31, 2013 $ 1,900 $ (176) $ (8,682)