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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
FINANCIAL ASSETS |  |
Securities held for investment | $ 8,333 | $ 8,593
Loans, net of allowance for loan losses | 3,918,699 | 3,810,509
FINANCIAL LIABILITIES |  |
Deposits | 5,698,591 | 5,904,704
Short-term borrowings | 3,777 | 3,982
Junior subordinated debentures | 26,804 | 26,804
Carrying Amount [Member] | Level 2 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | 1,655,061 | 1,913,895
Securities held for investment | 8,333 | 8,593
FINANCIAL LIABILITIES |  |
Deposits | 5,698,591 | 5,904,704
Short-term borrowings | 3,777 | 3,982
Junior subordinated debentures | 26,804 | 26,804
Carrying Amount [Member] | Level 3 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Loans, net of allowance for loan losses | 3,918,699 | 3,810,509
Fair Value [Member] |  |
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |
Loan commitments | 1,708 | 1,640
Letters of credit | 475 | 478
Fair Value [Member] | Level 2 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | 1,655,061 | 1,913,895
Securities held for investment | 8,398 | 8,671
FINANCIAL LIABILITIES |  |
Deposits | 5,750,163 | 5,945,502
Short-term borrowings | 3,777 | 3,982
Junior subordinated debentures | 28,123 | 31,200
Fair Value [Member] | Level 3 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Loans, net of allowance for loan losses | $ 3,965,439 | $ 3,847,791

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 + Details
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