REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	9 Months Ended
REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	Sep. 30, 2024
REVENUE FROM CONTRACTS WITH CUSTOMERS [Abstract]
Disaggregation of Revenue [Table Text Block]	Quarter ended September 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) $ 13,590 $ 146,585 $ 19,932 $ (1,634) $ 19,007 $ 4,584 $ 202,064 Service charges and fees on deposit accounts - 5,226 3,556 - 149 753 9,684 Insurance commission income - 2,824 - - 75 104 3,003 Card and processing income - 10,851 10 - 10 897 11,768 Other service charges and fees 55 979 842 - 698 157 2,731 Not in scope of ASC Topic 606 (1) 3,353 1,334 306 238 19 66 5,316 Total non-interest income 3,408 21,214 4,714 238 951 1,977 32,502 Total Revenue (Loss) $ 16,998 $ 167,799 $ 24,646 $ (1,396) $ 19,958 $ 6,561 $ 234,566 Quarter ended September 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) $ 18,279 $ 147,066 $ 13,212 $ (4,055) $ 19,749 $ 5,477 $ 199,728 Service charges and fees on deposit accounts - 5,286 3,406 - 155 705 9,552 Insurance commission income - 2,596 - - 68 126 2,790 Card and processing income - 9,982 24 - 23 812 10,841 Other service charges and fees 50 1,262 853 - 615 163 2,943 Not in scope of ASC Topic 606 (1) 2,971 1,044 185 (3) (14) (13) 4,170 Total non-interest income (loss) 3,021 20,170 4,468 (3) 847 1,793 30,296 Total Revenue (Loss) $ 21,300 $ 167,236 $ 17,680 $ (4,058) $ 20,596 $ 7,270 $ 230,024 Nine-Month Period Ended September 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) $ 43,745 $ 446,801 $ 49,787 $ (13,017) $ 56,139 $ 14,757 $ 598,212 Service charges and fees on deposit accounts - 15,761 10,584 - 452 2,274 29,071 Insurance commission income - 10,621 - - 161 514 11,296 Card and processing income - 31,561 52 - 119 2,871 34,603 Other service charges and fees 154 2,995 2,736 - 1,932 451 8,268 Not in scope of ASC Topic 606 (1) 9,934 4,145 659 419 22 106 15,285 Total non-interest income 10,088 65,083 14,031 419 2,686 6,216 98,523 Total Revenue (Loss) $ 53,833 $ 511,884 $ 63,818 $ (12,598) $ 58,825 $ 20,973 $ 696,735 Nine-Month Period Ended September 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) $ 61,427 $ 427,407 $ 41,085 $ (7,502) $ 60,369 $ 17,642 $ 600,428 Service charges and fees on deposit accounts - 15,859 9,886 - 492 2,143 28,380 Insurance commission income - 9,700 - - 175 509 10,384 Card and processing income - 30,035 74 - 103 2,682 32,894 Other service charges and fees 244 3,922 2,801 - 1,858 714 9,539 Not in scope of ASC Topic 606 (1) 8,913 2,909 4,027 1,837 221 (19) 17,888 Total non-interest income 9,157 62,425 16,788 1,837 2,849 6,029 99,085 Total Revenue (Loss) $ 70,584 $ 489,832 $ 57,873 $ (5,665) $ 63,218 $ 23,671 $ 699,513 (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. For the nine-month period ended September 30, 2024, revenue not within the scope of ASC Topic 606 includes $ 1.5 million in insurance proceeds, of which $ 0.8 million was received in the third quarter related to a 2020 outstanding insurance claim. For the nine-month period ended September 30, 2023, revenue not within the scope of ASC Topic 606 includes a $ 3.6 million gain recognized from a legal settlement and a $ 1.6 million gain on the repurchase of $ 21.4 million in junior subordinated debentures.