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, 2012
Dec. 31, 2011
Dec. 31, 2010
Short-term Debt [Line Items]      
Short Term Borrowings $ 589,814 $ 1,441,092  
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
      
Short-term Debt [Line Items]      
Short Term Borrowings 575,899 1,434,310  
Weighted average interest rate at year-end 0.15% 0.17% 0.19%
Maximum amount outstanding at month-end during the year 1,590,082 2,430,992 2,084,431
Average amount outstanding during the year 1,293,348 2,009,039 1,375,154
Weighted average interest rate during the year 0.14% 0.16% 0.19%
OtherBorrowings [Member]
      
Short-term Debt [Line Items]      
Short Term Borrowings 13,915 6,782  
Weighted average interest rate at year-end 1.98% 2.74% 0.53%
Maximum amount outstanding at month-end during the year 26,071 86,262 107,716
Average amount outstanding during the year $ 16,983 $ 46,245 $ 70,220
Weighted average interest rate during the year 1.36% 0.59% 0.43%