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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 22, 2021 | Oct. 21, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 2,000,000,000 |  |  | 2,000,000,000 | 2,000,000,000 |  | 2,000,000,000
Common stock, par value |  |  | $ 0.10 |  |  | $ 0.10 | $ 0.10 |  | $ 0.1
Common stock, shares issued |  |  | 223,655,186 |  |  | 223,655,186 | 223,655,186 |  | 223,034,348
Common stock, shares outstanding |  |  | 206,495,900 |  |  | 206,495,900 | 206,495,900 |  | 218,235,064
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.07 |  | $ 0.05 |  | $ 0.21 | $ 0.15 |
Stock Repurchase Program, Authorized Amount |  |  | $ 300,000,000 |  |  | $ 300,000,000 | $ 300,000,000 |  |
Stock Repurchase Program Expiration Date |  |  |  |  |  |  | Jun. 30, 2022 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 150,000,000 |  |  | $ 150,000,000 | $ 150,000,000 |  |
Preferred Stock, Shares Authorized |  |  | 50,000,000 |  |  | 50,000,000 | 50,000,000 |  | 50,000,000
Preferred stock, par value |  |  | $ 1.00 |  |  | $ 1.00 | $ 1.00 |  |
Liquidation value per share |  |  | $ 25 |  |  | $ 25 | $ 25 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  |  |  |  |  | 213,757 | 51,814 |
Stock repurchase plan treasury stock |  |  | 17,159,286 |  |  | 17,159,286 | 17,159,286 |  | 4,799,284
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 amount |  |  | $ 109,338,000 |  |  | $ 109,338,000 | $ 109,338,000 |  | $ 109,338,000
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock Redemption Amount |  | $ 36,100,000 |  |  |  |  |  |  |
Preferred Stock Redemption Date |  | Nov. 30, 2021 |  |  |  |  |  |  |
Preferred Stock Redemption Price Per Share |  | $ 25.00 |  |  |  |  |  |  |
Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock repurchased |  |  | 4,158,806 | 7,962,647 |  | 12,121,453 | 12,121,453 |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  | 7.125% |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  | 8.35% |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  | 7.40% |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  | 7.25% |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  | 7.00% |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record |  |  |  |  |  |  | Nov. 26, 2021 |  |
Dividends Payable, Date to be Paid |  |  |  |  |  |  | Dec. 10, 2021 |  |
Dividneds declared |  |  | $ 14,600,000 |  | $ 11,000,000.0 |  | $ 44,900,000 | $ 32,800,000 |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.10 |  |  |  |  |  |  |  |
Increase in cash dividend declared percent | 43.00% |  |  |  |  |  |  |  |
Increase in cash dividend declared per common share | $ 0.03 |  |  |  |  |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividneds declared |  |  | $ 700,000 |  | $ 700,000 |  | $ 2,000,000.0 | $ 2,000,000 |

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