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Loans (Details 6) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Loans      
Loans $ 6,148,298 [1] $ 5,715,556 [1]  
Interest which would have been recorded if the loans had not been in a non-accrual status 67 0 2,325
Interest income collected on non-accruing loans 0 2,288 2,375
Nonperforming Financing Receivable [Member]
     
Loans      
Loans 3,125 0 32,000
Private Corporation [Member]
     
Loans      
Loans 2,375,178 [1] 2,202,613 [1]  
Private Corporation [Member] | Nonperforming Financing Receivable [Member]
     
Loans      
Loans 3,125 0 32,000
Private Middle Market Companies [Member]
     
Loans      
Loans $ 574,107 [1] $ 681,912 [1]  
[1] Current ratings as of December 31, 2013 and 2012, respectively.