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LOAN PORTFOLIO- Selected Information on TDRs includes Recorded Investment by Loan Class and Modification Type (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 587,219 |  | $ 647,048 |  | $ 661,591 |  | $ 694,453
Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 363,930 |  | 375,809 |  | 382,672 |  |
Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 50,812 |  | 48,742 |  | 44,498 |  |
Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 94,112 |  | 133,521 |  | 150,254 |  |
Construction Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 41,800 |  |  |  |  |  |
Auto loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 22,605 |  | 24,875 |  | 21,582 |  |
Finance Leases [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,184 |  | 2,647 |  | 2,077 |  |
Other Consumer Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 11,783 |  | 14,842 |  | 14,794 |  |
Land Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,476 |  | 9,362 |  | 2,766 |  |
Residential Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 217 |  | 357 |  | 3,482 |  |
Commercial Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 35,100 |  | 36,893 |  | 39,466 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 35,947 |  | 37,645 |  | 35,697 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 25,964 |  | 29,254 |  | 29,066 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,563 |  | 6,044 |  | 4,379 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,510 |  | 2,111 |  | 2,163 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Auto loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Finance Leases [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Other Consumer Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 892 |  | 236 |  | 89 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Land Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 18 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Residential Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 38,683 |  | 88,535 |  | 87,159 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 8,318 |  | 8,373 |  | 6,027 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,094 |  | 2,007 |  | 1,244 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 20,648 |  | 66,830 |  | 75,104 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Auto loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,347 |  | 1,706 |  | 2,330 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Finance Leases [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 238 |  | 366 |  | 621 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Other Consumer Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,097 |  | 2,518 |  | 1,604 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Land Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 3,941 |  | 6,735 |  | 229 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Residential Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 340,753 |  | 355,812 |  | 380,714 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 267,578 |  | 280,588 |  | 297,310 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 31,870 |  | 30,005 |  | 26,109 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 16,049 |  | 16,359 |  | 27,214 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Auto loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 14,233 |  | 14,698 |  | 12,388 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Finance Leases [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,946 |  | 2,281 |  | 1,456 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Other Consumer Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,891 |  | 9,662 |  | 11,026 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Land Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,186 |  | 2,219 |  | 2,165 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Residential Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 3,046 |  |
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 35,317 |  | 38,055 |  | 42,820 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 863 |  | 3,027 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Auto loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Finance Leases [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Other Consumer Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 217 |  | 299 |  | 327 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Land Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Residential Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  | 0 |  | 0 |  |
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 35,100 |  | 36,893 |  | 39,466 |  |
Forbearance Agreements [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,623 |  |  |  |  |  |
Forbearance Agreements [Member] | Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Forbearance Agreements [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Forbearance Agreements [Member] | Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,623 |  |  |  |  |  |
Forbearance Agreements [Member] | Auto loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Forbearance Agreements [Member] | Finance Leases [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Forbearance Agreements [Member] | Other Consumer Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Forbearance Agreements [Member] | Land Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Forbearance Agreements [Member] | Residential Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Forbearance Agreements [Member] | Commercial Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |
Troubled Debt Restructurings Other [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 129,896 | [1] | 127,001 | [2] | 115,201 | [3] |
Troubled Debt Restructurings Other [Member] | Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 62,070 | [1] | 57,594 | [2] | 50,269 | [3] |
Troubled Debt Restructurings Other [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 10,285 | [1] | 10,686 | [2] | 12,766 | [3] |
Troubled Debt Restructurings Other [Member] | Commercial And Industrial Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 48,282 | [1] | 47,358 | [2] | 42,746 | [3] |
Troubled Debt Restructurings Other [Member] | Auto loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 7,025 | [1] | 8,471 | [2] | 6,864 | [3] |
Troubled Debt Restructurings Other [Member] | Finance Leases [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 0 | [1] | 0 | [2] | 0 | [3] |
Troubled Debt Restructurings Other [Member] | Other Consumer Loans [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,686 | [1] | 2,127 | [2] | 1,748 | [3] |
Troubled Debt Restructurings Other [Member] | Land Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 331 | [1] | 408 | [2] | 372 | [3] |
Troubled Debt Restructurings Other [Member] | Residential Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 217 | [1] | 357 | [2] | 436 | [3] |
Troubled Debt Restructurings Other [Member] | Commercial Construction [Member] |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 0 | [1] | $ 0 | [2] | $ 0 |  |
[1] | Other concessions granted by the Corporation include 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 include 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.
[3] | Other concessions granted by the Corporation include 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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