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Loans Reconciliation of Carrying Amount of Acquired Impaired Loans (Details) (Covered Loans, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Covered Loans
           
Reconciliation of Carrying Amount of Acquired Impaired Loans [Line Items]            
Contractual required payments receivable $ 811,319     $ 1,333,127    
Nonaccretable difference (284,382)     (313,751)    
Expected cash flows 526,937     1,019,376    
Accretable yield (79,138)     (128,024)    
Carrying balance $ 447,799 $ 537,257 $ 762,386 $ 891,352 $ 964,314 $ 1,128,978