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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Class Of Stock [Line Items] |  |  |
Common stock, shares authorized | 2,000,000,000 | 2,000,000,000 |
Common stock, par value | $ 0.1 | $ 0.1 |
Common stock, shares issued | 220,382,343 | 221,789,509 |
Common stock, shares outstanding | 216,278,040 | 217,240,844 |
Corporation has authorized shares of preferred stock | 50,000,000 | 50,000,000 |
Preferred stock, par value | $ 1 | $ 1 |
Liquidation value per share |  | $ 25 |
Repurchased of common stock |  | 433,362 | 336,985
Stock repurchase plan treasury stock | 4,104,303 | 4,548,665 |
Legal surplus reserve rate |  | 10.00% |
Original amount contributed in percentage |  | 20.00% |
Legal Surplus Amount Additions | $ 7,300 | $ 0 |
Legal surplus reserve amount | $ 59,693 | $ 59,693 |
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% |

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- Definition Minimum percentage of net income for the year transferred to a legal surplus reserve until such surplus equals the total of paid-in-capital on common and preferred stock. Amounts transferred to the legal surplus reserve from the retained earnings account are not available for distribution to the Corporation, including for payment as dividends to the stockholders, without the prior consent of the Puerto Rico Commissioner of Financial Institutions. + References No definition available. + Details
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