Annual report pursuant to Section 13 and 15(d)

Short Term Borrowings (Details)

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Short Term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Short-term Debt [Line Items]      
Short Term Borrowings $ 1,441,092 $ 2,040,732  
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
      
Short-term Debt [Line Items]      
Short Term Borrowings 1,434,310 1,965,677  
Weighted average interest rate at year-end 0.17% 0.19% 0.21%
Maximum amount outstanding at month-end during the year 2,430,992 2,084,431 1,094,736
Average amount outstanding during the year 2,009,039 1,375,154 902,780
Weighted average interest rate during the year 0.16% 0.19% 0.21%
OtherBorrowings [Member]
      
Short-term Debt [Line Items]      
Short Term Borrowings 6,782 75,055  
Weighted average interest rate at year-end 2.74% 0.53% 1.17%
Maximum amount outstanding at month-end during the year 86,262 107,716 54,208
Average amount outstanding during the year $ 46,245 $ 70,220 $ 30,034
Weighted average interest rate during the year 0.59% 0.43% 1.47%