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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Investment [Line Items]    
Estimated fair value, less than 12 months $ 57,966 $ 101,792
Estimated fair value, 12 months or more 3,606 3,554
Estimated fair value, total 61,572 105,346
Unrealized losses, 12 months or more 1,311 2,661
Unrealized losses, less than 12 months 187 262
Unrealized losses, total 1,498 2,923
State and Political Subdivisions [Member]
    
Investment [Line Items]    
Estimated fair value, less than 12 months 57,966 101,792
Estimated fair value, 12 months or more 3,606 3,554
Estimated fair value, total 61,572 105,346
Unrealized losses, 12 months or more 1,311 2,661
Unrealized losses, less than 12 months 187 262
Unrealized losses, total 1,498 2,923
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