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Employee Benefit Plans (Schedule of SERP's Pension Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Service cost - benefits earned during the year $ 3,452 $ 2,799  
Interest cost on projected benefit obligations 2,819 2,570  
Supplemental Executive Retirement Plan [Member]
      
Service cost - benefits earned during the year 144 115 89
Interest cost on projected benefit obligations 335 307 295
Net amortization and deferral 551 360 250
Net periodic pension cost $ 1,030 $ 782 $ 634