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LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 587,219 |  | $ 647,048 |  | $ 661,591 | $ 694,453
Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 212,524 | [1] | 262,161 | [2] |  |
Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 374,695 |  | 384,887 |  |  |
Non Fha Va Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 363,930 |  | 375,809 |  | 382,672 |
Non Fha Va Residential Mortgage Loans [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 83,201 | [1] | 80,153 | [2] |  |
Non Fha Va Residential Mortgage Loans [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 280,729 |  | 295,656 |  |  |
Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 50,812 |  | 48,742 |  | 44,498 |
Commercial Mortgage Loans [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 27,483 | [1] | 16,402 | [2] |  |
Commercial Mortgage Loans [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 23,329 |  | 32,340 |  |  |
Commercial And Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 94,112 |  | 133,521 |  | 150,254 |
Commercial And Industrial Loans [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 52,576 | [1] | 115,025 | [2] |  |
Commercial And Industrial Loans [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 41,536 |  | 18,496 |  |  |
Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 41,800 |  |  |  |  |
Auto loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 22,605 |  | 24,875 |  | 21,582 |
Auto loans [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 7,057 | [1] | 8,622 | [2] |  |
Auto loans [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 15,548 |  | 16,253 |  |  |
Finance Leases [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,184 |  | 2,647 |  | 2,077 |
Finance Leases [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 216 | [1] | 105 | [2] |  |
Finance Leases [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,968 |  | 2,542 |  |  |
Other Consumer Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 11,783 |  | 14,842 |  | 14,794 |
Other Consumer Loans [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,489 | [1] | 2,974 | [2] |  |
Other Consumer Loans [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 10,294 |  | 11,868 |  |  |
Land Construction [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,476 |  | 9,362 |  | 2,766 |
Land Construction [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,185 | [1] | 1,630 | [2] |  |
Land Construction [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,291 |  | 7,732 |  |  |
Residential Construction [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 217 |  | 357 |  | 3,482 |
Residential Construction [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 217 | [1] | 357 | [2] |  |
Residential Construction [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Commercial Construction [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 35,100 |  | 36,893 |  | $ 39,466 |
Commercial Construction [Member] | Non Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 35,100 | [1] | 36,893 |  |  |
Commercial Construction [Member] | Accrual [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 0 |  | $ 0 |  |  |
[1] | Included in non-accrual loans are $88.6 million in loans that are 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.
[2] | Included in non-accrual loans are $110.6 million in loans that are 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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