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Short-Term Borrowings | 12 Months Ended
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Dec. 31, 2011
Short-Term Borrowings [Abstract] |
Short-Term Borrowings | Note 18—Short-term Borrowings Short-term borrowings at December 31 were as follows:
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | Ending Balance |  |  | Average Balance |  |  | Average Rate |  |  | Ending Balance |  |  | Average Balance |  |  | Average Rate |  |  | Ending Balance |  |  | Average Balance |  |  | Average Rate |
|  | (dollars in thousands) |
Federal funds purchased |  | $ | 75,300 |  |  | $ | 15,642 |  |  |  | 0.26 | % |  | $ | 12,800 |  |  | $ | 40,322 |  |  |  | 0.26 | % |  | $ | 630,000 |  |  | $ | 584,691 |  |  |  | 0.29 | %
Borrowings from FHLB |  |  | 84,000 |  |  |  | 7,537 |  |  |  | 0.21 |  |  |  | 0 |  |  |  | 277,329 |  |  |  | 0.39 |  |  |  | 125,000 |  |  |  | 274,699 |  |  |  | 0.48 |
Securities sold under agreements to repurchase |  |  | 153,477 |  |  |  | 155,551 |  |  |  | 0.43 |  |  |  | 170,563 |  |  |  | 165,945 |  |  |  | 0.47 |  |  |  | 199,526 |  |  |  | 168,527 |  |  |  | 0.72 |
Treasury, tax and loan note option |  |  | 0 |  |  |  | 4,134 |  |  |  | 0.00 |  |  |  | 4,498 |  |  |  | 4,482 |  |  |  | 0.00 |  |  |  | 4,406 |  |  |  | 3,747 |  |  |  | 0.00 |
Total |  | $ | 312,777 |  |  | $ | 182,864 |  |  |  | 0.40 |  |  | $ | 187,861 |  |  | $ | 488,078 |  |  |  | 0.40 |  |  | $ | 958,932 |  |  | $ | 1,031,664 |  |  |  | 0.41 |
Maximum total at any month-end |  | $ | 312,777 |  |  |  |  |  |  |  |  |  |  | $ | 1,000,753 |  |  |  |  |  |  |  |  |  |  | $ | 1,155,933 |  |  |  |  |  |  |  |  |
Weighted average rate at year-end |  |  |  |  |  |  |  |  |  |  | 0.28 | % |  |  |  |  |  |  |  |  |  |  | 0.43 | % |  |  |  |  |  |  |  |  |  |  | 0.30 | %
Interest expense on short-term borrowings for the years ended December 31 is detailed below:
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (dollars in thousands) |
Federal funds purchased |  | $ | 41 |  |  | $ | 105 |  |  | $ | 1,678 |
Borrowings from FHLB |  |  | 16 |  |  |  | 1,069 |  |  |  | 1,328 |
Securities sold under agreements to repurchase |  |  | 671 |  |  |  | 774 |  |  |  | 1,210 |
Total interest on short-term borrowings |  | $ | 728 |  |  | $ | 1,948 |  |  | $ | 4,216 |

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