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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | $ 1,963,106 | $ 1,857,535 | $ 1,716,052 | $ 1,945,148
Securities held for investment | 11,269 |  |  |
Loans, net | 3,502,346 | 3,348,112 | 3,181,303 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,737,850 | 5,419,519 | 5,174,512 |
Short-term borrowings | 8,603 | 4,590 | 4,891 |
Long-term borrowings | 2,000 | 6,938 | 11,040 |
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 | 1,966,106 |  | 1,716,052 |
Securities held for investment | 11,269 |  | 16,099 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,737,850 |  | 5,174,512 |
Short-term borrowings | 8,603 |  | 4,891 |
Long-term borrowings | 2,000 |  | 11,040 |
Junior subordinated debentures | 26,804 |  | 26,804 |
Carrying Amount [Member] | Level 3 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Loans, net | 3,502,346 |  | 3,181,303 |
Fair Value [Member] |  |  |  |
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |  |  |
Loan commitments | 1,712 |  | 1,556 |
Letters of credit | 459 |  | 469 |
Fair Value [Member] | Level 2 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 1,966,106 |  | 1,716,052 |
Securities held for investment | 11,351 |  | 16,317 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,538,503 |  | 5,200,273 |
Short-term borrowings | 8,603 |  | 4,891 |
Long-term borrowings | 1,997 |  | 11,010 |
Junior subordinated debentures | 28,948 |  | 31,093 |
Fair Value [Member] | Level 3 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Loans, net | $ 3,424,944 |  | $ 3,240,479 |

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