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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 9,113,955 | $ 8,858,123 | $ 8,640,291
Commercial Portfolio Segment [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans and Leases Receivable, Gross | 3,930,293 | 3,750,202 |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans and Leases Receivable, Gross | 2,279,685 | 2,148,111 | $ 2,009,049
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 735,800 | $ 796,800 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + 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 + Details
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