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Fair Value of Financial Instruments (Schedule of Estimated Fair Value of Financial Instruments) (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Available for sale securities $ 7,717,634 $ 7,294,303
Trading securities 32,074 11,710
Non-marketable securities 109,867 103,521
Short-term federal funds sold and securities purchased under agreements to resell 10,845 10,135
Long-term securities purchased under agreements to resell 850,000 450,000
Interest earning deposits with banks 535,696 122,076
Cash and due from banks 340,594 328,464
Derivative instruments 18,495 [1] 18,823 [1]
Non-interest bearing deposits 4,834,750 4,494,028
Savings, interest checking and money market deposits 8,139,989 7,846,831
Federal funds purchased and securities sold under agreements to repurchase 1,282,470 982,827
Other borrowings 111,929 112,273
Derivative instruments 19,687 [1] 19,584 [1]
Carrying Amount [Member]
   
Loans, including held for sale 9,279,437  
Available for sale securities 7,717,634  
Trading securities 32,074  
Non-marketable securities 109,867  
Short-term federal funds sold and securities purchased under agreements to resell 10,845  
Long-term securities purchased under agreements to resell 850,000  
Interest earning deposits with banks 535,696  
Cash and due from banks 340,594  
Accrued interest receivable 63,607  
Derivative instruments 18,495  
Non-interest bearing deposits 4,834,750  
Savings, interest checking and money market deposits 8,139,989  
Time open and C.D.'s 2,681,827  
Federal funds purchased and securities sold under agreements to repurchase 1,282,470  
Other borrowings 111,929  
Accrued interest payable 9,422  
Derivative instruments 19,687  
Estimated Fair Value [Member]
   
Loans, including held for sale 9,384,425  
Available for sale securities 7,717,634  
Trading securities 32,074  
Non-marketable securities 109,867  
Short-term federal funds sold and securities purchased under agreements to resell 10,845  
Long-term securities purchased under agreements to resell 865,065  
Interest earning deposits with banks 535,696  
Cash and due from banks 340,594  
Accrued interest receivable 63,607  
Derivative instruments 18,495  
Non-interest bearing deposits 4,834,750  
Savings, interest checking and money market deposits 8,139,989  
Time open and C.D.'s 2,694,678  
Federal funds purchased and securities sold under agreements to repurchase 1,286,324  
Other borrowings 122,572  
Accrued interest payable 9,422  
Derivative instruments $ 19,687  
[1] The fair value of each class of derivative is shown in Note 10.