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LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Financing Receivable Modifications [Line Items] |  |  |  |
Total TDR loans | $ 587,219 | $ 647,048 | $ 661,591 | $ 694,453
Performing Financing Receivable [Member] | Non Accrual [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Total TDR loans | $ 88,600 | $ 110,600 |  |

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