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SUBSEQUENT EVENTS - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 27, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Classified and non-performing loans sold |  |  |  | $ 16,300 |  | $ 147,500 |  |  |  |
OREO Sold |  |  |  |  |  | 2,900 |  |  |  |
Branches Doral | 10 |  |  |  |  |  |  |  |  |
Gains Losses On Extinguishment Of Debt |  | $ 2,300 |  |  |  |  |  | $ 1,391 | $ 4,217 | $ 0
Trust Preferred Securties Discount |  | 10.00% |  |  | 30.00% |  | 19.00% |  |  |
Trust Preferred Securities Winning Bid |  | 90.00% |  |  | 70.00% |  | 81.00% |  |  |
Trust Preferred Securities Repurchases |  | $ 23,800 |  |  | $ 10,000 |  | $ 7,300 |  |  |
Sales Price Of Bulk Sale |  |  |  |  |  | 87,300 |  |  |  |
Proceeds From Sale Of Non Performing Assets Sold |  |  |  | 11,300 |  |  |  |  |  |
PreTax Loss Bulk Sale |  |  |  | 1,800 |  | 48,700 |  |  |  |
Reserves Allocated To Bulk Sale |  |  |  | 2,800 |  | 15,300 |  |  | $ 2,800 |
Bulk Sale Charge Offs |  |  |  | 4,600 |  | 61,400 |  |  |  |
Classified And Non Performing Loans Sold Outstanding Balance |  |  |  | $ 20,100 |  |  |  |  |  |
Commercial Mortgage Loans [Member] |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Classified and non-performing loans sold |  |  |  |  |  | 90,700 |  |  |  |
Commercial And Industrial Loan [Member] |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Classified and non-performing loans sold |  |  |  |  |  | 45,800 |  |  |  |
Construction Loans [Member] |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Classified and non-performing loans sold |  |  |  |  |  | $ 11,000 |  |  |  |
Puerto Rico Electric Power Authority [Member] |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Classified and non-performing loans sold |  |  | $ 64,000 |  |  |  |  |  |  |
Proceeds From Sale Of Non Performing Assets Sold |  |  | 53,200 |  |  |  |  |  |  |
PreTax Loss Bulk Sale |  |  | 600 |  |  |  |  |  |  |
Reserves Allocated To Bulk Sale |  |  | 10,200 |  |  |  |  |  |  |
Classified And Non Performing Loans Sold Outstanding Balance |  |  | $ 75,000 |  |  |  |  |  |  |

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