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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
FINANCIAL ASSETS |  |
Securities held for investment | $ 8,379 | $ 8,789
Loans, net of allowance for loan losses | 4,230,541 | 4,190,382
FINANCIAL LIABILITIES |  |
Deposits | 6,010,872 | 5,973,358
Short-term borrowings | 1,300 | 500
Junior subordinated debentures | 31,959 | 31,959
Carrying Amount [Member] | Level 2 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | 1,668,325 | 1,598,177
Securities held for investment | 7,879 | 8,289
FINANCIAL LIABILITIES |  |
Deposits | 6,010,872 | 5,973,538
Short-term borrowings | 1,300 | 500
Junior subordinated debentures | 31,959 | 31,959
Carrying Amount [Member] | Level 3 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Securities held for investment | 500 | 500
Loans, net of allowance for loan losses | 4,230,541 | 4,190,382
Fair Value [Member] |  |
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |
Loan commitments | 1,634 | 1,681
Letters of credit | 443 | 464
Fair Value [Member] | Level 2 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | 1,668,325 | 1,598,177
Securities held for investment | 7,934 | 8,350
FINANCIAL LIABILITIES |  |
Deposits | 6,061,676 | 6,028,012
Short-term borrowings | 1,300 | 500
Junior subordinated debentures | 34,886 | 33,793
Fair Value [Member] | Level 3 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Securities held for investment | 500 | 500
Loans, net of allowance for loan losses | $ 4,286,603 | $ 4,222,153

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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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