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Fair Value (Schedule Of Estimated Fair Values Of Financial Instruments) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Securities$ 4,604,835$ 1,488,885
Loans, net11,102,2694,957,164
Loans held for sale64,54521,866
Deposits15,292,2096,775,719
Federal funds purchased19,427 
Securities sold under agreements to repurchase880,323364,676
Other short-term borrowings3,284 
FHLB borrowings 10,172
Long-term notes356,363376
Carrying Amount [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash, interest-bearing deposits, federal funds sold, and short-term investments1,268,928778,851
Securities4,604,8351,488,885
Loans, net10,984,1564,875,167
Loans held for sale64,54521,866
Accrued interest receivable52,01830,157
Deposits15,292,2096,775,719
Federal funds purchased19,427 
Securities sold under agreements to repurchase880,323364,676
Other short-term borrowings3,284 
FHLB borrowings 10,172
Long-term notes356,363376
Accrued interest payable11,0684,007
Fair Value [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash, interest-bearing deposits, federal funds sold, and short-term investments1,268,928778,851
Securities4,604,8351,488,885
Loans, net11,124,9245,085,925
Loans held for sale64,54521,866
Accrued interest receivable52,01830,157
Deposits15,321,7256,787,931
Federal funds purchased19,427 
Securities sold under agreements to repurchase880,323364,676
Other short-term borrowings3,284 
FHLB borrowings 10,172
Long-term notes322,186376
Accrued interest payable$ 11,068$ 4,007