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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Estimated fair values of company's financial instruments |  |  |  |
Cash and cash equivalents | $ 1,945,148 | $ 1,707,733 | $ 1,204,079 | $ 1,036,510
Securities held for investment | 16,416 | 22,477 |  |
Total loans (net of unearned interest) | 3,242,427 | 3,013,498 |  |
Allowance for loan losses | (38,725) | (37,656) |  |
Loans, net | 3,203,702 | 2,975,842 |  |
Deposits | 5,440,830 | 5,037,735 |  |
Short-term borrowings | 4,571 | 8,274 |  |
Long-term borrowings | 9,178 | 18,476 |  |
Junior subordinated debentures | 26,804 | 36,083 |  |
Carrying Amount [Member] |  |  |  |
Estimated fair values of company's financial instruments |  |  |  |
Cash and cash equivalents | 1,945,848 | 1,708,133 |  |
Securities held for investment | 16,416 | 22,477 |  |
Total loans (net of unearned interest) | 3,242,427 | 3,013,498 |  |
Allowance for loan losses | (38,725) | (37,656) |  |
Loans, net | 3,203,702 | 2,975,842 |  |
Deposits | 5,440,830 | 5,037,735 |  |
Short-term borrowings | 4,571 | 8,274 |  |
Long-term borrowings | 9,178 | 18,476 |  |
Junior subordinated debentures | 26,804 | 36,083 |  |
Fair Value [Member] |  |  |  |
Estimated fair values of company's financial instruments |  |  |  |
Cash and cash equivalents | 1,945,848 | 1,708,133 |  |
Securities held for investment | 16,689 | 22,958 |  |
Loans, net | 3,264,948 | 3,022,619 |  |
Deposits | 5,466,958 | 5,052,470 |  |
Short-term borrowings | 4,571 | 8,274 |  |
Long-term borrowings | 9,224 | 18,578 |  |
Junior subordinated debentures | 28,144 | 39,300 |  |
Loan commitments | 1,498 | 1,257 |  |
Letters of credit | $ 440 | $ 419 |  |

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