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Securities Available For Sale (Summary Of Securities Available For Sale) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available for sale Securities [Line Items]      
Available for Sale, Amortized Cost $ 467,731 $ 461,635  
Available for Sale, Gross Unrealized Gains 8,204 7,165  
Available for Sale, Gross Unrealized Losses 11,108 18,630  
Available for Sale, Estimated Fair Value 464,827 450,170  
US Government-Sponsored Enterprises [Member]
     
Schedule of Available for sale Securities [Line Items]      
Available for Sale, Amortized Cost 282,743 277,838  
Available for Sale, Gross Unrealized Gains 4,450 4,386  
Available for Sale, Gross Unrealized Losses 5,672 8,592 8,592
Available for Sale, Estimated Fair Value 281,521 273,632  
US Government Agency [Member]
     
Schedule of Available for sale Securities [Line Items]      
Available for Sale, Amortized Cost 83,545 83,153  
Available for Sale, Gross Unrealized Gains 1,064 833  
Available for Sale, Gross Unrealized Losses 1,520 2,457 2,457
Available for Sale, Estimated Fair Value 83,089 81,529  
Private Label Mortgage-Backed Securities [Member]
     
Schedule of Available for sale Securities [Line Items]      
Available for Sale, Amortized Cost 4,629 5,423  
Available for Sale, Gross Unrealized Gains 891 825  
Available for Sale, Gross Unrealized Losses 11 78 78
Available for Sale, Estimated Fair Value 5,509 6,170  
Obligations Of States And Political Subdivisions Thereof [Member]
     
Schedule of Available for sale Securities [Line Items]      
Available for Sale, Amortized Cost 96,814 95,221  
Available for Sale, Gross Unrealized Gains 1,799 1,121  
Available for Sale, Gross Unrealized Losses 3,905 7,503 7,503
Available for Sale, Estimated Fair Value $ 94,708 $ 88,839