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, 2013
Dec. 31, 2012
Dec. 31, 2011
Short-term Debt [Line Items]      
Short Term Borrowings $ 552,143 $ 589,814  
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
      
Short-term Debt [Line Items]      
Short Term Borrowings 548,605 575,899  
Weighted average interest rate at year-end 0.06% 0.15% 0.17%
Maximum amount outstanding at month-end during the year 787,127 1,590,082 2,430,992
Average amount outstanding during the year 692,481 1,293,348 2,009,039
Weighted average interest rate during the year 0.08% 0.14% 0.16%
OtherBorrowings [Member]
      
Short-term Debt [Line Items]      
Short Term Borrowings 3,538 13,915  
Weighted average interest rate at year-end 2.59% 1.98% 2.74%
Maximum amount outstanding at month-end during the year 19,497 26,071 86,262
Average amount outstanding during the year $ 7,815 $ 16,983 $ 46,245
Weighted average interest rate during the year 1.79% 1.36% 0.59%