REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	6 Months Ended
REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	Jun. 30, 2024
REVENUE FROM CONTRACTS WITH CUSTOMERS [Abstract]
Disaggregation of Revenue [Table Text Block]	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) $ 14,332 $ 151,269 $ 14,927 $ (4,851) $ 18,884 $ 5,067 $ 199,628 Service charges and fees on deposit accounts - 5,254 3,536 - 155 780 9,725 Insurance commission income - 2,563 - - 30 193 2,786 Card and processing income - 10,472 18 - 31 1,002 11,523 Other service charges and fees 41 973 1,018 - 613 153 2,798 Not in scope of ASC Topic 606 (1) 3,620 1,201 244 98 5 38 5,206 Total non-interest income 3,661 20,463 4,816 98 834 2,166 32,038 Total Revenue (Loss) $ 17,993 $ 171,732 $ 19,743 $ (4,753) $ 19,718 $ 7,233 $ 231,666 Quarter ended June 30, 2023 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) $ 21,360 $ 142,597 $ 12,933 $ (2,789) $ 19,690 $ 6,024 $ 199,815 Service charges and fees on deposit accounts - 5,087 3,326 - 172 702 9,287 Insurance commission income - 2,464 - - 79 204 2,747 Card and processing income - 10,152 28 - 49 906 11,135 Other service charges and fees 33 1,508 1,094 - 660 207 3,502 Not in scope of ASC Topic 606 (1) 3,029 1,010 3,697 1,680 195 (11) 9,600 Total non-interest income 3,062 20,221 8,145 1,680 1,155 2,008 36,271 Total Revenue (Loss) $ 24,422 $ 162,818 $ 21,078 $ (1,109) $ 20,845 $ 8,032 $ 236,086 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) $ 30,155 $ 300,216 $ 29,855 $ (11,383) $ 37,132 $ 10,173 $ 396,148 Service charges and fees on deposit accounts - 10,535 7,028 - 303 1,521 19,387 Insurance commission income - 7,797 - - 86 410 8,293 Card and processing income - 20,710 42 - 109 1,974 22,835 Other service charges and fees 99 2,016 1,894 - 1,234 294 5,537 Not in scope of ASC Topic 606 (1) 6,581 2,811 353 181 3 40 9,969 Total non-interest income 6,680 43,869 9,317 181 1,735 4,239 66,021 Total Revenue (Loss) $ 36,835 $ 344,085 $ 39,172 $ (11,202) $ 38,867 $ 14,412 $ 462,169 Six-Month Period Ended June 30, 2023 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) $ 43,148 $ 280,341 $ 27,873 $ (3,447) $ 40,620 $ 12,165 $ 400,700 Service charges and fees on deposit accounts - 10,573 6,480 - 337 1,438 18,828 Insurance commission income - 7,104 - - 107 383 7,594 Card and processing income - 20,053 50 - 80 1,870 22,053 Other service charges and fees 194 2,660 1,948 - 1,243 551 6,596 Not in scope of ASC Topic 606 (1) 5,942 1,865 3,842 1,840 235 (6) 13,718 Total non-interest income 6,136 42,255 12,320 1,840 2,002 4,236 68,789 Total Revenue (Loss) $ 49,284 $ 322,596 $ 40,193 $ (1,607) $ 42,622 $ 16,401 $ 469,489 (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.