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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 22, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jul. 22, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.18 | $ 0.16 | $ 0.54 | $ 0.48 |  |  |  |  |
Preferred Stock Shares Authorized |  | 50,000,000 |  | 50,000,000 |  |  |  |  |  |
Preferred stock, par value |  | $ 1.00 |  | $ 1.00 |  |  |  |  |  |
Treasury Stock Shares Acquired |  | 2,386,504 | 898 | 5,353,068 | 5,984,078 |  |  |  |  |
Treasury Stock Shares |  | 64,528,220 | 59,787,306 | 64,528,220 | 59,787,306 | 62,155,321 | 59,794,239 |  | 59,797,663 | 54,360,304
Legal surplus reserve rate |  |  |  | 10.00% |  |  |  |  |  |
Puerto Rico Banking Law Description |  |  |  | The Puerto Rico Banking Law provides that, when the expenditures of a Puerto Rico commercial bank are greater than receipts, the excess of the expenditures over receipts must be charged against the undistributed profits of the bank, and the balance, if any, must be charged against the legal surplus reserve, as a reduction thereof. If the legal surplus reserve is not sufficient to cover such balance in whole or in part, the outstanding amount must be charged against the capital account and the Bank cannot pay dividends until it can replenish the legal surplus reserve to an amount of at least 20% of the original capital contributed. |  |  |  |  |  |
Legal Surplus Amount Additions |  |  |  | $ 0 |  |  |  |  |  |
Legal surplus reserve |  | $ 230,178,000 |  | $ 230,178,000 |  |  | $ 230,178,000 |  |  |
Preferred Stock Shares Outstanding |  | 0 |  | 0 |  |  | 0 |  |  |
Stock Issued During Period Shares Treasury Stock Reissued |  | 13,605 | 14,947 | 627,905 | 564,232 |  |  |  |  |
Dividends paid on common stock |  | $ 28,700,000 | $ 26,300,000 | $ 87,400,000 | $ 79,700,000 |  |  |  |  |
Common stock per share paid |  | $ 0.18 | $ 0.16 | $ 0.54 | $ 0.48 |  |  |  |  |
Trust Preferred Securities [Member] | Parent Company [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchased face amount |  | $ 61,700,000 |  | $ 61,700,000 |  |  |  |  |  |
Stock Repurchase Program Announced July 22, 2024 [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock Shares Acquired |  |  |  | 5,158,809 |  |  |  |  |  |
Common stock repurchased price per share |  |  |  | $ 19.38 |  |  |  |  |  |
Remaining authorization to repurchase |  | 38,300,000 |  | $ 38,300,000 |  |  |  |  |  |
Repurchase program authorize amount |  |  |  |  |  |  |  | $ 250,000,000 |  |
Common stock repurchase value |  |  |  | 100,000,000.0 |  |  |  |  |  |
Stock Repurchase Program Announced July 22, 2024 [Member] | Trust Preferred Securities [Member] | Parent Company [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchased face amount |  | $ 61,700,000 |  | $ 61,700,000 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.18 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | O2025 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend Payable Date To Be Paid Day Month And Year | Dec. 12, 2025 |  |  |  |  |  |  |  |  |
Dividends Payable Date Of Record Day Month And Year | Nov. 28, 2025 |  |  |  |  |  |  |  |  |
Dividends Payable Date Declared Day Month And Year | Oct. 22, 2025 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Stock Repurchase Program Announced October 22, 2025 [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase program authorize amount | $ 200,000,000 |  |  |  |  |  |  |  |  |

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