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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Investment [Line Items]    
Estimated fair value less than 12 months $ 101,792 $ 19,758
Estimated fair value 12 months or more 3,554   
Estimated fair value total 105,346 19,758
Unrealized losses, 12 months or more 2,661 112
Unrealized losses, less than 12 months 262   
Unrealized losses, total 2,923 112
State and Political Subdivisions [Member]
    
Investment [Line Items]    
Estimated fair value less than 12 months 101,792 19,758
Estimated fair value 12 months or more 3,554   
Estimated fair value total 105,346 19,758
Unrealized losses, 12 months or more 2,661 112
Unrealized losses, less than 12 months 262   
Unrealized losses, total 2,923 112
Certificates of Deposit [Member]
    
Investment [Line Items]    
Estimated fair value less than 12 months      
Estimated fair value 12 months or more      
Estimated fair value total      
Unrealized losses, 12 months or more      
Unrealized losses, less than 12 months      
Unrealized losses, total