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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jul. 24, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Apr. 27, 2022 | Dec. 31, 2021
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.14 | $ 0.12 | $ 0.42 | $ 0.34 |  |  |  |  |  |
Preferred Stock Shares Authorized |  | 50,000,000 |  | 50,000,000 |  |  |  |  |  |  |
Preferred stock, par value |  | $ 1.00 |  | $ 1.00 |  |  |  |  |  |  |
Treasury Stock Shares Acquired |  | 5,393,236 | 5,385,857 | 9,258,611 | 16,066,747 |  |  |  |  |  |
Treasury Stock Shares |  | 49,276,790 | 37,405,457 | 49,276,790 | 37,405,457 |  | 43,906,494 | 40,954,057 | 32,036,780 |  | 21,836,611
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 Amount |  | $ 168,484,000 |  | $ 168,484,000 |  |  |  | $ 168,484,000 |  |  |
Preferred Stock Shares Outstanding |  | 0 |  | 0 |  |  |  | 0 |  |  |
Stock Issued During Period Shares Treasury Stock Reissued |  | 23,903 | 21,924 | 994,332 | 513,009 |  |  |  |  |  |
Shares Paid For Tax Withholding For Share Based Compensation |  | 778 |  | 288,613 |  |  |  |  |  |  |
Dividends paid on common stock |  | $ 24,900,000 | $ 22,700,000 | $ 75,600,000 | $ 65,900,000 |  |  |  |  |  |
New Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Shares Acquired |  | 5,392,458 |  | 8,969,998 |  |  |  |  |  |  |
Common stock repurchased price per share |  | $ 13.91 |  | $ 13.94 |  |  |  |  |  |  |
Stock Repurchase Program Authorized Amount 1 |  |  |  |  |  |  |  |  |  | $ 350,000,000 |
Stock Repurchased During Period Shares |  | 0 |  |  |  |  |  |  |  |  |
Common stock repurchase value |  | $ 75,000,000 |  | $ 125,000,000 |  |  |  |  |  |  |
Stock Repurchase Program Announced July 24, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program Authorized Amount 1 |  |  |  |  |  | $ 225,000,000 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend Payable Date To Be Paid Day Month And Year | Dec. 08, 2023 |  |  |  |  |  |  |  |  |  |
Dividends Payable Date Of Record Day Month And Year | Nov. 24, 2023 |  |  |  |  |  |  |  |  |  |
Dividends Payable Date Declared Day Month And Year | Oct. 31, 2023 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Common Stock Outstanding [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.14 |  |  |  |  |  |  |  |  |  |

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