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Securities Continuous Unrealized Loss (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 148,898 $ 35,173
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 6,831 181
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 385 346
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 115 154
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 149,283 35,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 6,946 335
US Government and Government Agencies and Authorities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 45,822 9,966
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 3,253 19
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 45,822 9,966
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 3,253 19
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 95,325 25,207
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 3,179 162
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 95,325 25,207
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 3,179 162
US States and Political Subdivisions Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 7,751  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 399  
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  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7,751  
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 399  
Trust Preferred Securities Individual Issuer [Member]
    
Schedule of Available-for-sale Securities [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 385 346
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 115 154
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 385 346
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses $ 115 $ 154