REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	6 Months Ended
REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	Jun. 30, 2023
REVENUE FROM CONTRACTS WITH CUSTOMERS [Abstract]
Disaggregation of Revenue [Table Text Block]	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 (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 commissions - 2,464 - - 79 204 2,747 Merchant-related income - 2,035 - - 39 385 2,459 Credit and debit card fees - 8,117 28 - 10 521 8,676 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 $ 24,422 $ 162,818 $ 21,078 $ (1,109) $ 20,845 $ 8,032 $ 236,086 Quarter ended June 30, 2022 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Net interest income (1) $ 26,335 $ 102,397 $ 31,379 $ 11,466 $ 18,688 $ 5,921 $ 196,186 Service charges and fees on deposit accounts - 5,495 3,069 - 157 745 9,466 Insurance commissions - 2,724 - - 20 202 2,946 Merchant-related income - 1,711 381 - 17 327 2,436 Credit and debit card fees - 7,391 21 - 3 449 7,864 Other service charges and fees 59 2,066 876 - 485 157 3,643 Not in scope of ASC Topic 606 (1) 4,108 396 101 (51) (4) 36 4,586 Total non-interest income 4,167 19,783 4,448 (51) 678 1,916 30,941 Total Revenue $ 30,502 $ 122,180 $ 35,827 $ 11,415 $ 19,366 $ 7,837 $ 227,127 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 (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 commissions - 7,104 - - 107 383 7,594 Merchant-related income - 4,298 - - 68 853 5,219 Credit and debit card fees - 15,755 50 - 12 1,017 16,834 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 $ 49,284 $ 322,596 $ 40,193 $ (1,607) $ 42,622 $ 16,401 $ 469,489 Six-Month Period Ended June 30, 2022 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Net interest income (1) $ 52,114 $ 191,943 $ 71,794 $ 18,875 $ 35,170 $ 11,914 $ 381,810 Service charges and fees on deposit accounts - 11,034 6,045 - 295 1,455 18,829 Insurance commissions - 7,691 - - 49 481 8,221 Merchant-related income - 3,533 754 - 22 716 5,025 Credit and debit card fees - 14,062 37 - (4) 859 14,954 Other service charges and fees 202 3,176 1,989 - 984 314 6,665 Not in scope of ASC Topic 606 (1) 9,217 750 177 (163) 76 48 10,105 Total non-interest income 9,419 40,246 9,002 (163) 1,422 3,873 63,799 Total Revenue $ 61,533 $ 232,189 $ 80,796 $ 18,712 $ 36,592 $ 15,787 $ 445,609 (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.
Activity of Contract Liabilities [Table Text Block]	Quarter Ended June 30, Six-Month Period Ended June 30, 2023 2022 2023 2022 (In thousands) Beginning balance $ 760 $ 1,154 $ 841 $ 1,443 Revenue recognized (152) (105) (233) (394) Ending balance $ 608 $ 1,049 $ 608 $ 1,049