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LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - TDR [Member] - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | $ 482,046 |  | $ 478,928 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 100,343 |  | 103,719 |  |  |
Financing Receivable Modifications Recorded Investment | 582,389 | $ 589,795 | 582,647 | $ 557,196 | $ 572,376 | $ 587,219
Residential Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 271,067 |  | 271,766 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 55,636 |  | 62,136 |  |  |
Financing Receivable Modifications Recorded Investment | 326,703 |  | 333,902 |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 63,216 |  | 66,603 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 7,294 |  | 8,318 |  |  |
Financing Receivable Modifications Recorded Investment | 70,510 |  | 74,921 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment | 5,000 |  |  |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 523 |  | 0 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 0 |  | 762 |  |  |
Financing Receivable Modifications Recorded Investment | 523 |  | 762 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 0 |  | 0 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 0 |  | 0 |  |  |
Financing Receivable Modifications Recorded Investment | 0 |  | 0 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 980 |  | 1,071 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 3,460 |  | 3,694 |  |  |
Financing Receivable Modifications Recorded Investment | 4,440 |  | 4,765 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 125,793 |  | 116,830 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 27,573 |  | 21,119 |  |  |
Financing Receivable Modifications Recorded Investment | 153,366 |  | 137,949 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment | 26,800 |  |  |  |  |
Consumer Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 8,485 |  | 9,025 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 616 |  | 1,357 |  |  |
Financing Receivable Modifications Recorded Investment | 9,101 |  | 10,382 |  |  |
Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 10,385 |  | 11,842 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 5,739 |  | 6,189 |  |  |
Financing Receivable Modifications Recorded Investment | 16,124 |  | 18,031 |  |  |
Consumer Portfolio Segment [Member] | Finance Lease [Member] |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Accrual Status | 1,597 |  | 1,791 |  |  |
Financing Receivable Modifications Recorded Investment Nonaccrual | 25 |  | 144 |  |  |
Financing Receivable Modifications Recorded Investment | $ 1,622 |  | $ 1,935 |  |  |

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