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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
FINANCIAL ASSETS |  |
Securities held for investment, Carrying Amount | $ 1,428 | $ 2,292
Loans, net of allowance for loan losses, Carrying Amount | 4,924,587 | 4,670,329
Securities held for investment, Fair Value | 1,433 | 2,303
Loans held for sale, Fair Value | 8,174 | 6,173
FINANCIAL LIABILITIES |  |
Deposits, Carrying Amount | 6,605,495 | 6,415,045
Short-term borrowings, Carrying Amount | 1,675 | 900
Junior subordinated debentures, Carrying Amount | 26,804 | 31,959
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |
Loan commitments, Fair Value | 2,158 | 1,839
Letters of credit, Fair Value | 421 | 428
Level 2 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents, Carrying Amount | 1,424,255 | 1,758,575
Securities held for investment, Carrying Amount | 928 | 1,792
Loans held for sale, Carrying Amount | 8,174 | 6,173
Cash and cash equivalents, Fair Value | 1,424,255 | 1,758,575
Securities held for investment, Fair Value | 933 | 1,803
Loans held for sale, Fair Value | 8,174 | 6,173
FINANCIAL LIABILITIES |  |
Deposits, Carrying Amount | 6,605,495 | 6,415,045
Short-term borrowings, Carrying Amount | 1,675 | 900
Junior subordinated debentures, Carrying Amount | 26,804 | 31,959
Deposits, Fair Value | 6,713,542 | 6,490,309
Short-term borrowings, Fair Value | 1,675 | 900
Junior subordinated debentures, Fair Value | 29,549 | 34,661
Level 3 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Securities held for investment, Carrying Amount | 500 | 500
Loans, net of allowance for loan losses, Carrying Amount | 4,924,587 | 4,670,329
Securities held for investment, Fair Value | 500 | 500
Loans, net of allowance for loan losses, Fair Value | $ 4,901,159 | $ 4,663,608

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- Definition The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1,2,3) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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