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Investments (Gross Unrealized Losses And Fair Values Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 126,637 $ 182,255
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 3,814 8,361
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 98,286 80,051
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 21,190 25,488
US Treasury Securities [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0  
US government agencies [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 34,814 62,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 1,223 3,154
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 21,417 13,996
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 2,657 2,067
Residential mortgage-backed agencies [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 22,928 60,781
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 937 1,801
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 52,347 46,570
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 2,773 3,022
Commercial mortgage-backed agencies [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 25,570 21,889
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 634 1,134
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 4,732 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 387 0
Collateralized mortgage obligations [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 20,448 21,201
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 573 1,149
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 3,051
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 13
Obligations of states and political subdivisions [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 10,877 15,422
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 447 1,123
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,761 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 242 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,444 2,301
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 416 (559)
Collateralized debt obligations [Member]
    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 18,029 16,434
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ 15,131 $ 20,386