REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	6 Months Ended
REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	Jun. 30, 2025
REVENUE FROM CONTRACTS WITH CUSTOMERS [Abstract]
Disaggregation of Revenue [Table Text Block]	Quarter ended June 30, 2025 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Net interest income (loss) (1) $ 17,670 $ 145,902 $ 42,056 $ (27,130) $ 20,442 $ 16,919 $ 215,859 Service charges and fees on deposit accounts - 7,365 1,487 - 147 757 9,756 Insurance commission income - 2,295 - - 54 189 2,538 Card and processing income - 10,375 229 - 31 1,245 11,880 Other service charges and fees 13 1,720 22 - 285 131 2,171 Not in scope of ASC Topic 606 (1) 3,485 609 157 19 345 (10) 4,605 Total non-interest income 3,498 22,364 1,895 19 862 2,312 30,950 Total Revenue (Loss) $ 21,168 $ 168,266 $ 43,951 $ (27,111) $ 21,304 $ 19,231 $ 246,809 Quarter ended June 30, 2024 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Net interest income (loss) (1) $ 18,185 $ 135,852 $ 38,519 $ (27,066) $ 18,960 $ 15,178 $ 199,628 Service charges and fees on deposit accounts - 7,666 1,125 - 155 779 9,725 Insurance commission income - 2,563 - - 30 193 2,786 Card and processing income - 9,848 226 - 31 1,418 11,523 Other service charges and fees 41 1,753 238 - 613 153 2,798 Not in scope of ASC Topic 606 (1) 3,565 1,304 160 122 16 39 5,206 Total non-interest income 3,606 23,134 1,749 122 845 2,582 32,038 Total Revenue (Loss) $ 21,791 $ 158,986 $ 40,268 $ (26,944) $ 19,805 $ 17,760 $ 231,666 Six-Month Period Ended June 30, 2025 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Net interest income (loss) (1) $ 35,256 $ 288,917 $ 84,865 $ (54,789) $ 41,231 $ 32,776 $ 428,256 Service charges and fees on deposit accounts - 14,680 2,928 - 289 1,499 19,396 Insurance commission income - 7,880 - - 93 370 8,343 Card and processing income - 19,825 633 - 53 2,844 23,355 Other service charges and fees 34 3,301 41 - 567 270 4,213 Not in scope of ASC Topic 606 (1) 7,046 2,871 550 170 714 26 11,377 Total non-interest income 7,080 48,557 4,152 170 1,716 5,009 66,684 Total Revenue (Loss) $ 42,336 $ 337,474 $ 89,017 $ (54,619) $ 42,947 $ 37,785 $ 494,940 Six-Month Period Ended June 30, 2024 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Net interest income (loss) (1) $ 36,331 $ 268,991 $ 76,095 $ (51,756) $ 36,945 $ 29,542 $ 396,148 Service charges and fees on deposit accounts - 15,283 2,281 - 303 1,520 19,387 Insurance commission income - 7,797 - - 86 410 8,293 Card and processing income - 19,487 450 - 109 2,789 22,835 Other service charges and fees 99 3,570 340 - 1,234 294 5,537 Not in scope of ASC Topic 606 (1) 6,628 2,716 330 233 20 42 9,969 Total non-interest income 6,727 48,853 3,401 233 1,752 5,055 66,021 Total Revenue (Loss) $ 43,058 $ 317,844 $ 79,496 $ (51,523) $ 38,697 $ 34,597 $ 462,169 (1) Most of the Corporation’s revenue is not within the scope of ASC Topic 606. The guidance explicitly excludes net interest income from financial assets and liabilities, as well as other non-interest income from loans, leases, investment securities and derivative financial instruments.