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LOAN PORTFOLIO - Selected Information on TDRs Includes Recorded Investment by Loan Class and Modification Type (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 625,720 |  | $ 557,196 | $ 587,219 |  | $ 585,795 | $ 568,543 | $ 647,048
Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 30,456 |  |  | 35,947 |  |  |  |
Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 68,786 |  |  | 38,683 |  |  |  |
Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 402,948 |  |  | 340,753 |  |  |  |
Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 228 |  |  | 35,317 |  |  |  |
Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 4,383 |  |  | 6,623 |  |  |  |
Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 118,919 | [1] |  | 129,896 | [2] |  |  |
Non Fha Va Residential Mortgage Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 340,269 |  |  | 363,930 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 24,053 |  |  | 25,964 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 11,496 |  |  | 8,318 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 245,022 |  |  | 267,578 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 158 |  |  | 0 |  |  |  |
Non Fha Va Residential Mortgage Loans [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 59,540 | [1] |  | 62,070 | [2] |  |  |
Commercial Mortgage Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 169,205 |  |  | 50,812 |  |  |  |
Commercial Mortgage Loans [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 4,400 |  |  | 6,563 |  |  |  |
Commercial Mortgage Loans [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 30,980 |  |  | 2,094 |  |  |  |
Commercial Mortgage Loans [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 124,493 |  |  | 31,870 |  |  |  |
Commercial Mortgage Loans [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Commercial Mortgage Loans [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Commercial Mortgage Loans [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 9,332 | [1] |  | 10,285 | [2] |  |  |
Commercial And Industrial Loan [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 79,711 |  |  | 94,112 |  |  |  |
Commercial And Industrial Loan [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 688 |  |  | 2,510 |  |  |  |
Commercial And Industrial Loan [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 19,963 |  |  | 20,648 |  |  |  |
Commercial And Industrial Loan [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 13,323 |  |  | 16,049 |  |  |  |
Commercial And Industrial Loan [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Commercial And Industrial Loan [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 4,225 |  |  | 6,623 |  |  |  |
Commercial And Industrial Loan [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 41,512 | [1] |  | 48,282 | [2] |  |  |
Land [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,475 |  |  | 6,476 |  |  |  |
Land [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 16 |  |  | 18 |  |  |  |
Land [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 104 |  |  | 3,941 |  |  |  |
Land [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,016 |  |  | 2,186 |  |  |  |
Land [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Land [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Land [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 339 | [1] |  | 331 | [2] |  |  |
Construction-commercial [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 3,319 |  |  | 35,100 |  |  |  |
Construction-commercial [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-commercial [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 3,102 |  |  | 0 |  |  |  |
Construction-commercial [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-commercial [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 35,100 |  |  |  |
Construction-commercial [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-commercial [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 217 | [1] |  | 0 | [2] |  |  |
Construction-residential [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 217 |  |  |  |
Construction-residential [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-residential [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-residential [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-residential [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-residential [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Construction-residential [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 | [1] |  | 217 | [2] |  |  |
Construction Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,800 |  |  |  |  |  |  |
Consumer Auto Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 18,892 |  |  | 22,605 |  |  |  |
Consumer Auto Loans [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Consumer Auto Loans [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,627 |  |  | 1,347 |  |  |  |
Consumer Auto Loans [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 11,066 |  |  | 14,233 |  |  |  |
Consumer Auto Loans [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Consumer Auto Loans [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Consumer Auto Loans [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,199 | [1] |  | 7,025 | [2] |  |  |
Finance Leases [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,372 |  |  | 2,184 |  |  |  |
Finance Leases [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Finance Leases [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 116 |  |  | 238 |  |  |  |
Finance Leases [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,256 |  |  | 1,946 |  |  |  |
Finance Leases [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Finance Leases [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Finance Leases [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 | [1] |  | 0 | [2] |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 10,477 |  |  | 11,783 |  |  |  |
Consumer Portfolio Segment [Member] | Interest Rate Below Market [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,299 |  |  | 892 |  |  |  |
Consumer Portfolio Segment [Member] | Maturity or Term Extension [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,398 |  |  | 2,097 |  |  |  |
Consumer Portfolio Segment [Member] | Combination of reduction in interest rate and extension of maturity [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,772 |  |  | 6,891 |  |  |  |
Consumer Portfolio Segment [Member] | Forgiveness of principal and/or interest [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 228 |  |  | 217 |  |  |  |
Consumer Portfolio Segment [Member] | Foberance Agrrements [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  | 0 |  |  |  |
Consumer Portfolio Segment [Member] | Other [Member] |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 1,780 | [1] |  | $ 1,686 | [2] |  |  |
[1] | Other concessions granted by the Corporation included deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation, or a combination of the concessions listed in the table.
[2] | Other concessions granted by the Corporation included deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation or a combination of the concessions listed in the table.

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