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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | $ 1,856,437 | $ 1,857,535 | $ 1,720,239 | $ 1,945,148
Securities held for investment | 9,297 |  |  |
Loans, net | 3,622,611 | 3,348,112 | 3,206,102 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,721,593 | 5,419,519 | 5,150,411 |
Short-term borrowings | 12,317 | 4,590 | 3,522 |
Long-term borrowings |  | 6,938 | 9,964 |
Junior subordinated debentures | 26,804 | 26,804 | 26,804 |
Carrying Amount [Member] | Level 2 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 1,856,437 |  | 1,720,239 |
Securities held for investment | 9,297 |  | 14,511 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,721,593 |  | 5,150,411 |
Short-term borrowings | 12,317 |  | 3,522 |
Long-term borrowings |  |  | 9,964 |
Junior subordinated debentures | 26,804 |  | 26,804 |
Carrying Amount [Member] | Level 3 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Loans, net | 3,622,611 |  | 3,206,102 |
Fair Value [Member] |  |  |  |
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |  |  |
Loan commitments | 1,791 |  | 1,574 |
Letters of credit | 426 |  | 437 |
Fair Value [Member] | Level 2 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 1,856,437 |  | 1,720,239 |
Securities held for investment | 9,386 |  | 14,654 |
FINANCIAL LIABILITIES |  |  |  |
Deposits | 5,754,876 |  | 5,175,528 |
Short-term borrowings | 12,317 |  | 3,522 |
Long-term borrowings |  |  | 9,906 |
Junior subordinated debentures | 28,948 |  | 28,991 |
Fair Value [Member] | Level 3 Inputs [Member] |  |  |  |
FINANCIAL ASSETS |  |  |  |
Loans, net | $ 3,661,752 |  | $ 3,238,652 |

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