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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  | $ 0 | $ 23,408 |  |  |
Amortized cost | $ 2,066,355 |  |  |  |  | $ 2,066,355 |  |  | $ 1,903,878 |
Available for sale Securities [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage Of Debt Securities Government And Government Sponsored Agencies | 99.00% |  |  |  |  | 99.00% |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held | $ 6,792 | $ 6,792 | $ 6,792 |  |  | $ 6,792 | 6,792 | $ 6,792 | 6,792 | $ 28,981
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses | 0 | 0 |  |  |  | 0 | 12,231 |  |  |
Available for sale Securities [Member] | Puerto Rico Government obligations [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held |  | 0 | 34,400 |  |  |  | 0 |  |  | 22,189
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses |  |  |  | $ 12,200 |  |  | 12,231 |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate |  |  |  |  | 100.00% |  |  |  |  |
Available for sale Securities [Member] | Private label MBS [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held | 6,792 | 6,792 | 6,792 |  |  | 6,792 | 6,792 | $ 6,792 | $ 6,792 | $ 6,792
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses | $ 0 | $ 0 |  |  |  | $ 0 | $ 0 |  |  |
Loans Receivable, Description of Variable Rate Basis |  |  |  |  |  | The interest rate on these private-label MBS is variable, tied to 3-month LIBOR and limited to the weighted-average coupon on the underlying collateral. |  |  |  |
Available for sale Securities [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member] | Private label MBS [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality, Additional Information |  |  |  |  |  | The underlying mortgages are fixed-rate, single-family loans with original high FICO scores (over 700) and moderate loan-to-value ratios (under 80%), as well as moderate delinquency levels. |  |  |  |
Available for sale Securities [Member] | Minimum [Member] | Puerto Rico Government obligations [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Recovery Rate |  |  |  | 15.00% |  |  |  |  |  |
Available for sale Securities [Member] | Maximum [Member] | Puerto Rico Government obligations [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Recovery Rate |  |  |  | 80.00% |  |  |  |  |  |
Available for sale Securities [Member] | Weighted Average [Member] | Puerto Rico Government obligations [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Recovery Rate |  |  |  | 41.00% |  |  |  |  |  |
Available for sale Securities [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Puerto Rico | Puerto Rico Government obligations [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  | 23,400 |  |  |  |  |  |  |
Amortized cost |  |  | $ 23,000 |  |  |  |  |  |  |
Held-to-maturity Securities [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage Of Held To Maturity Securities | 70.00% |  |  |  |  | 70.00% |  |  |  |

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