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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 17, 2017 | Dec. 31, 2014
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  | $ 23,408 | $ 219,780 | $ 0 |  |
Percentage Of Debt Securities Government And Government Sponsored Agencies |  |  |  |  |  |  | 98.00% |  |  |  |
Amortized cost of private label of mortgage backed security |  |  |  |  |  |  | $ 1,903,454 |  |  |  |
Maximum loan to value ratio |  |  |  |  |  |  | 80.00% |  |  |  |
Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities |  |  |  |  |  |  | $ 232,977 | 390,286 | 296,950 |  |
Fair Value |  |  |  |  |  |  | 1,891,016 | 1,881,920 |  |  |
Amortized cost |  |  |  |  |  |  | $ 1,903,878 | $ 1,908,557 |  |  |
Weighted average yield |  |  |  |  |  |  | 2.27% | 2.14% |  |  |
Net gain on sale of investments |  |  |  |  |  |  | $ 371 | $ 6,104 | 0 |  |
Interest Receivable |  |  |  |  |  |  | 57,172 | 45,453 |  |  |
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net | [1] |  |  |  |  |  | $ 12,231 | 6,687 | 16,517 |  |
Percentage Of Held To Maturity Securities |  |  |  |  |  |  | 70.00% |  |  |  |
Percentage Of Stockholders Equity Exceeded By Securities Issuers |  |  |  |  |  |  | 10.00% |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held |  |  |  |  | $ 22,294 |  | $ 6,792 | 28,981 | 22,294 |  | $ 5,777
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery Rate |  |  | 80.00% |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery Rate |  |  | 15.00% |  |  |  |  |  |  |  |
Weighted Average [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery Rate |  |  | 41.00% |  |  |  |  |  |  |  |
U S Treasury Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  | 15,000 |  |  |
Gain Loss On Sale Of Investments |  |  |  |  |  |  |  | 8 |  |  |
Mortgage Backed Securities Issued By Private Enterprises [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  | 204,800 |  |  |
Gain Loss On Sale Of Investments |  |  |  |  |  |  |  | 6,100 |  |  |
Puerto Rico Government obligations [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  | $ 23,400 |  |  |  |  | 23,400 |  |  |  |
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net |  |  | $ 12,200 | $ 6,300 | $ 3,000 | $ 12,900 |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held |  |  |  |  |  |  |  |  |  | $ 34,400 |
Puerto Rico Government obligations [Member] | Puerto Rico Government Debt Securities Other Than Temporary Impairment [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  |  |  | $ 23,000 |
Default Rate |  |  | 100.00% |  |  |  |  |  |  |  |
Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  | 1,274,497 | 1,348,725 |  |  |
Amortized cost |  |  |  |  |  |  | $ 1,281,690 | $ 1,356,342 |  |  |
Weighted average yield |  |  |  |  |  |  | 2.54% | 2.49% |  |  |
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net |  |  |  |  |  |  |  | $ 400 | $ 600 |  |
Mortgage Backed Securities [Member] | Collateralized Mortgage Obligations [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  | $ 44,061 | 58,812 |  |  |
Amortized cost |  |  |  |  |  |  | $ 43,805 | $ 58,971 |  |  |
Weighted average yield |  |  |  |  |  |  | 2.22% | 1.43% |  |  |
[1] | For the years ended December 31, 2017, 2016 and 2015, approximately $12.2 million, $6.3 million and $15.9 million, respectively, of the credit impairment recognized in earnings consisted of credit losses on Puerto Rico government debt securities that were sold in the second quarter of 2017, as further discussed below. The remaining impairment losses for the years ended December 31, 2016 and 2015 were associated with credit losses on private label MBS.

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