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LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 625,720 |  | $ 557,196 | $ 587,219 |  | $ 585,795 | $ 568,543 | $ 647,048
Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 510,846 |  |  | 374,695 |  |  |  |
Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 114,874 | [1] |  | 212,524 | [2] |  |  |
Non Fha Va Residential Mortgage Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 340,269 |  |  | 363,930 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 270,067 |  |  | 280,729 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 70,202 | [1] |  | 83,201 | [2] |  |  |
Commercial Mortgage Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 169,205 |  |  | 50,812 |  |  |  |
Commercial Mortgage Loans [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 146,293 |  |  | 23,329 |  |  |  |
Commercial Mortgage Loans [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 22,912 | [1] |  | 27,483 | [2] |  |  |
Commercial And Industrial Loan [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 79,711 |  |  | 94,112 |  |  |  |
Commercial And Industrial Loan [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 70,416 |  |  | 41,536 |  |  |  |
Commercial And Industrial Loan [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 9,295 | [1] |  | 52,576 | [2] |  |  |
Land [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,019 |  |  | 6,476 |  |  |  |
Land [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,080 |  |  | 1,291 |  |  |  |
Land [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 3,939 | [1] |  | 5,185 | [2] |  |  |
Construction-commercial [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 35,100 |  |  |  |
Construction-commercial [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-commercial [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 | [1] |  | 35,100 | [2] |  |  |
Construction-residential [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 775 |  |  | 217 |  |  |  |
Construction-residential [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-residential [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 775 | [1] |  | 217 | [2] |  |  |
Consumer Auto Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 18,891 |  |  | 22,605 |  |  |  |
Consumer Auto Loans [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 12,541 |  |  | 15,548 |  |  |  |
Consumer Auto Loans [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,350 | [1] |  | 7,057 | [2] |  |  |
Finance Leases [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,372 |  |  | 2,184 |  |  |  |
Finance Leases [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,273 |  |  | 1,968 |  |  |  |
Finance Leases [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 99 | [1] |  | 216 | [2] |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 10,478 |  |  | 11,783 |  |  |  |
Consumer Portfolio Segment [Member] | Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 9,176 |  |  | 10,294 |  |  |  |
Consumer Portfolio Segment [Member] | Non Accrual [Member] |  |  |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 1,302 | [1] |  | $ 1,489 | [2] |  |  |
[1] | Excludes a construction TDR loan held for sale of $27.0 million as of September 30, 2018.
[2] | Included in non-accrual loans are $88.6 million in loans that were performing under the terms of the restructuring agreement but are reported in non-accrual status until the restructured loans meet the criteria of sustained payment performance under the revised terms for reinstatement to accrual status and are deemed fully collectible.

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