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LOAN PORTFOLIO - Selected Information on TDRs Includes Recorded Investment by Loan Class and Modification Type (Detail) - Entity Loan Modification Program [Member] - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 582,389 | $ 589,795 | $ 582,647 | $ 557,196 | $ 572,376 | $ 587,219
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 70,510 |  | 74,921 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 153,366 |  | 137,949 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 26,800 |  |  |  |  |
Other Loans Member [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 326,703 |  | 333,902 |  |  |
Other Loans Member [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 9,101 |  | 10,382 |  |  |
Construction Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,000 |  |  |  |  |
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 523 |  | 762 |  |  |
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 4,440 |  | 4,765 |  |  |
Consumer Auto Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 16,124 |  | 18,031 |  |  |
Finance Lease [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,622 |  | 1,935 |  |  |
Interest rate below market [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 26,757 |  | 28,771 |  |  |
Interest rate below market [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 627 |  | 664 |  |  |
Interest rate below market [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 3,882 |  | 3,966 |  |  |
Interest rate below market [Member] | Other Loans Member [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 20,893 |  | 22,729 |  |  |
Interest rate below market [Member] | Other Loans Member [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,329 |  | 1,396 |  |  |
Interest rate below market [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Interest rate below market [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Interest rate below market [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 26 |  | 16 |  |  |
Interest rate below market [Member] | Consumer Auto Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Interest rate below market [Member] | Finance Lease [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Extended Maturity [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 38,507 |  | 39,283 |  |  |
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 18,861 |  | 19,769 |  |  |
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,804 |  | 2,005 |  |  |
Extended Maturity [Member] | Other Loans Member [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 12,502 |  | 11,586 |  |  |
Extended Maturity [Member] | Other Loans Member [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,161 |  | 1,236 |  |  |
Extended Maturity [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 523 |  | 545 |  |  |
Extended Maturity [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Extended Maturity [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,371 |  | 2,524 |  |  |
Extended Maturity [Member] | Consumer Auto Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,212 |  | 1,517 |  |  |
Extended Maturity [Member] | Finance Lease [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 73 |  | 101 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 379,103 |  | 394,235 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 12,605 |  | 13,323 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 118,774 |  | 122,709 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Other Loans Member [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 230,894 |  | 239,348 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Other Loans Member [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,125 |  | 5,651 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,782 |  | 1,933 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Consumer Auto Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 8,778 |  | 10,085 |  |  |
Combination of reduction in interest rate and extension of maturity [Member] | Finance Lease [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,145 |  | 1,186 |  |  |
Forgiveness of principal and/or interest [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 227 |  | 275 |  |  |
Forgiveness of principal and/or interest [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forgiveness of principal and/or interest [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forgiveness of principal and/or interest [Member] | Other Loans Member [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forgiveness of principal and/or interest [Member] | Other Loans Member [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 227 |  | 275 |  |  |
Forgiveness of principal and/or interest [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forgiveness of principal and/or interest [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forgiveness of principal and/or interest [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forgiveness of principal and/or interest [Member] | Consumer Auto Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forgiveness of principal and/or interest [Member] | Finance Lease [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forbearance Agreement [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 20,843 |  | 2,818 |  |  |
Forbearance Agreement [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 709 |  | 2,673 |  |  |
Forbearance Agreement [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 19,991 |  | 0 |  |  |
Forbearance Agreement [Member] | Other Loans Member [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 143 |  | 145 |  |  |
Forbearance Agreement [Member] | Other Loans Member [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forbearance Agreement [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forbearance Agreement [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forbearance Agreement [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forbearance Agreement [Member] | Consumer Auto Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Forbearance Agreement [Member] | Finance Lease [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Other Loan Modifications [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 116,952 |  | 117,265 |  |  |
Other Loan Modifications [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 37,708 |  | 38,492 |  |  |
Other Loan Modifications [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 8,915 |  | 9,269 |  |  |
Other Loan Modifications [Member] | Other Loans Member [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 62,271 |  | 60,094 |  |  |
Other Loan Modifications [Member] | Other Loans Member [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,259 |  | 1,824 |  |  |
Other Loan Modifications [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 217 |  |  |
Other Loan Modifications [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  |  |
Other Loan Modifications [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 261 |  | 292 |  |  |
Other Loan Modifications [Member] | Consumer Auto Loans [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,134 |  | 6,429 |  |  |
Other Loan Modifications [Member] | Finance Lease [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 404 |  | $ 648 |  |  |

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