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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Estimated fair values of company's financial instruments |  |  |  |
Cash and Cash Equivalents | $ 1,912,614 | $ 1,707,733 | $ 1,610,292 | $ 1,204,079
Securities held for investment | 16,769 |  |  |
Total loans (net of unearned interest) | 3,116,096 | 3,013,498 | 2,984,114 |
Allowance for loan losses | (37,258) | (37,656) | (37,456) |
Loans, net | 3,078,838 | 2,975,842 | 2,946,658 |
Deposits | 5,253,505 | 5,037,735 | 4,887,332 |
Short-term borrowings | 5,665 | 8,274 | 12,279 |
Long-term borrowings | 11,255 | 18,476 | 28,049 |
Junior subordinated debentures | 26,804 | 36,083 | 36,083 |
Carrying Amount [Member] |  |  |  |
Estimated fair values of company's financial instruments |  |  |  |
Cash and Cash Equivalents | 1,912,614 |  | 1,610,292 |
Securities held for investment | 16,769 |  | 22,677 |
Total loans (net of unearned interest) | 3,116,096 |  | 2,984,114 |
Allowance for loan losses | (37,258) |  | (37,456) |
Loans, net | 3,078,838 |  | 2,946,658 |
Deposits | 5,253,505 |  | 4,887,332 |
Short-term borrowings | 5,665 |  | 12,279 |
Long-term borrowings | 11,255 |  | 28,049 |
Junior subordinated debentures | 26,804 |  | 36,083 |
Fair Value [Member] |  |  |  |
Estimated fair values of company's financial instruments |  |  |  |
Cash and Cash Equivalents | 1,912,614 |  | 1,610,292 |
Securities held for investment | 17,080 |  | 23,257 |
Loans, net | 3,143,799 |  | 2,979,289 |
Deposits | 5,275,969 |  | 4,898,752 |
Short-term borrowings | 5,665 |  | 12,279 |
Long-term borrowings | 11,333 |  | 28,236 |
Junior subordinated debentures | 28,777 |  | 37,691 |
Loan commitments | 1,300 |  | 1,119 |
Letters of credit | $ 458 |  | $ 439 |

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