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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | $ 1,826,936 | $ 1,945,148 | $ 1,912,614 | $ 1,707,733
Securities held for investment | 12,213 |  |  |
Loans, net | 3,320,079 | 3,203,702 | 3,078,838 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,309,464 | 5,440,830 | 5,253,505 |
Short-term borrowings | 5,074 | 4,571 | 5,665 |
Long-term borrowings | 8,938 | 9,178 | 11,255 |
Junior subordinated debentures | 26,804 | 26,804 | 26,804 |
Carrying Amount [Member] |  |  |  |
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |  |  |
Loan commitments |  |  |  |
Letters of credit |  |  |  |
Carrying Amount [Member] | Level 2 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 1,826,936 |  | 1,912,614 |
Securities held for investment | 12,213 |  | 16,769 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,309,464 |  | 5,253,505 |
Short-term borrowings | 5,074 |  | 5,665 |
Long-term borrowings | 8,938 |  | 11,255 |
Junior subordinated debentures | 26,804 |  | 26,804 |
Carrying Amount [Member] | Level 3 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Loans, net | 3,320,079 |  | 3,078,838 |
Fair Value [Member] |  |  |  |
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |  |  |
Loan commitments | 1,378 |  | 1,300 |
Letters of credit | 468 |  | 458 |
Fair Value [Member] | Level 2 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 1,826,936 |  | 1,912,614 |
Securities held for investment | 12,328 |  | 17,080 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,338,655 |  | 5,275,969 |
Short-term borrowings | 5,074 |  | 5,665 |
Long-term borrowings | 8,889 |  | 11,333 |
Junior subordinated debentures | 28,927 |  | 28,777 |
Fair Value [Member] | Level 3 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Loans, net | $ 3,346,578 |  | $ 3,143,799 |

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