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Loans (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fixed interest rates $ 3,252,331 $ 3,282,876
Floating interest rates 2,895,967 2,432,680
Loans and Leases Receivable $ 6,148,298 [1] $ 5,715,556 [1]
[1] Current ratings as of December 31, 2013 and 2012, respectively.