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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | $ 1,720,239 | $ 1,945,148 | $ 1,763,908 | $ 1,707,733
Securities held for investment | 14,511 |  |  |
Loans: |  |  |  |
Loans (net of unearned interest) | 3,245,084 | 3,242,427 | 3,065,439 |
Allowance for loan losses | (38,982) | (38,725) | (37,436) |
Loans, net | 3,206,102 | 3,203,702 | 3,028,003 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,150,411 | 5,440,830 | 5,099,648 |
Short-term borrowings | 3,522 | 4,571 | 6,340 |
Long-term borrowings | 9,964 | 9,178 | 11,329 |
Junior subordinated debentures | 26,804 | 26,804 | 26,804 |
Carrying Amount [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 1,720,239 |  | 1,763,908 |
Securities held for investment | 14,511 |  | 19,734 |
Loans: |  |  |  |
Loans (net of unearned interest) | 3,245,084 |  | 3,065,439 |
Allowance for loan losses | (38,982) |  | (37,436) |
Loans, net | 3,206,102 |  | 3,028,003 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,150,411 |  | 5,099,648 |
Short-term borrowings | 3,522 |  | 6,340 |
Long-term borrowings | 9,964 |  | 11,329 |
Junior subordinated debentures | 26,804 |  | 26,804 |
Fair Value [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 1,720,239 |  | 1,763,908 |
Securities held for investment | 14,654 |  | 20,104 |
Loans: |  |  |  |
Loans, net | 3,238,652 |  | 3,092,725 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,175,528 |  | 5,121,335 |
Short-term borrowings | 3,522 |  | 6,340 |
Long-term borrowings | 9,906 |  | 11,431 |
Junior subordinated debentures | 28,991 |  | 28,970 |
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |  |  |
Loan commitments | 1,574 |  | 1,321 |
Letters of credit | $ 437 |  | $ 428 |

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