SEGMENT INFORMATION (Tables)	6 Months Ended
SEGMENT INFORMATION (Tables)	Jun. 30, 2025
SEGMENT INFORMATION [Abstract]
Information by Segment [Table Text Block]	The following tables present information about the reportable segments for the indicated periods: Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Quarter ended June 30, 2025: Interest income $ 32,330 $ 105,243 $ 61,419 $ 33,145 $ 38,157 $ 7,896 $ 278,190 Net (charge) credit for transfer of funds (14,660) 79,150 (15,759) (57,180) (2,502) 10,951 - Interest expense - (38,491) (3,604) (3,095) (15,213) (1,928) (62,331) Net interest income (loss) 17,670 145,902 42,056 (27,130) 20,442 16,919 215,859 Provision for credit losses - expense (benefit) 351 17,203 701 (3) 2,015 320 20,587 Non-interest income 3,498 22,364 1,895 19 862 2,312 30,950 Non-interest expenses: Employees’ compensation and benefits 6,762 35,405 4,992 1,027 7,268 4,604 60,058 Occupancy and equipment 1,496 14,834 1,530 180 1,933 2,324 22,297 Business promotion 266 2,402 216 180 229 202 3,495 Professional fees 1,492 6,622 997 361 1,086 1,051 11,609 Taxes, other than income taxes 446 4,293 576 112 104 181 5,712 FDIC deposit insurance 417 770 673 - 237 138 2,235 Net (gain) loss on OREO operations (840) - 145 - - 104 (591) Credit and debit card processing expenses - 6,845 214 - 3 685 7,747 Other non-interest expenses (1) 789 6,323 1,366 637 731 929 10,775 Total non-interest expenses 10,828 77,494 10,709 2,497 11,591 10,218 123,337 Segment income (loss) $ 9,989 $ 73,569 $ 32,541 $ (29,605) $ 7,698 $ 8,693 $ 102,885 Average interest-earning assets $ 2,164,350 $ 4,018,961 $ 3,575,929 $ 5,638,582 $ 2,419,981 $ 457,177 $ 18,274,980 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Quarter ended June 30, 2024: Interest income $ 31,594 $ 105,256 $ 62,649 $ 28,912 $ 36,413 $ 7,421 $ 272,245 Net (charge) credit for transfer of funds (13,409) 69,962 (20,154) (44,035) (2,475) 10,111 - Interest expense - (39,366) (3,976) (11,943) (14,978) (2,354) (72,617) Net interest income (loss) 18,185 135,852 38,519 (27,066) 18,960 15,178 199,628 Provision for credit losses - (benefit) expense (9,832) 26,551 (2,084) 60 (3,524) 434 11,605 Non-interest income 3,606 23,134 1,749 122 845 2,582 32,038 Non-interest expenses: Employees’ compensation and benefits 6,611 33,889 4,712 848 7,015 4,381 57,456 Occupancy and equipment 1,451 14,583 1,423 178 1,980 2,236 21,851 Business promotion 404 3,017 282 187 276 193 4,359 Professional fees 1,960 6,923 989 371 1,040 1,148 12,431 Taxes, other than income taxes 450 4,069 474 103 140 172 5,408 FDIC deposit insurance 434 809 693 - 222 158 2,316 Net (gain) loss on OREO operations (1,503) - (2,205) - 2 97 (3,609) Credit and debit card processing expenses - 6,557 208 - 3 839 7,607 Other non-interest expenses (1) 672 6,448 1,513 586 666 978 10,863 Total non-interest expenses 10,479 76,295 8,089 2,273 11,344 10,202 118,682 Segment income (loss) $ 21,144 $ 56,140 $ 34,263 $ (29,277) $ 11,985 $ 7,124 $ 101,379 Average interest-earning assets $ 2,122,474 $ 4,022,781 $ 3,503,782 $ 5,842,575 $ 2,119,230 $ 419,052 $ 18,029,894 The following tables present information about the reportable segments for the indicated periods: Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Six-Month Period Ended June 30, 2025 Interest income $ 64,394 $ 210,996 $ 123,291 $ 65,783 $ 75,557 $ 15,234 $ 555,255 Net (charge) credit for transfer of funds (29,138) 154,247 (31,039) (111,897) (3,541) 21,368 - Interest expense - (76,326) (7,387) (8,675) (30,785) (3,826) (126,999) Net interest income (loss) 35,256 288,917 84,865 (54,789) 41,231 32,776 428,256 Provision for credit losses - expense (benefit) 1,027 37,223 3,355 (8) 2,864 936 45,397 Non-interest income 7,080 48,557 4,152 170 1,716 5,009 66,684 Non-interest expenses: Employees’ compensation and benefits 13,734 72,024 10,756 2,167 14,267 9,247 122,195 Occupancy and equipment 3,013 29,963 3,134 353 3,811 4,653 44,927 Business promotion 469 4,722 434 350 502 296 6,773 Professional fees 3,032 12,866 2,039 709 2,034 2,415 23,095 Taxes, other than income taxes 917 8,687 1,181 232 221 352 11,590 FDIC deposit insurance 832 1,548 1,341 - 474 276 4,471 Net (gain) loss on OREO operations (1,936) - 181 - - 35 (1,720) Credit and debit processing expenses - 10,847 474 - 5 1,531 12,857 Other non-interest expenses (1) 1,761 13,056 2,778 1,285 1,442 1,849 22,171 Total non-interest expenses 21,822 153,713 22,318 5,096 22,756 20,654 246,359 Segment income (loss) $ 19,487 $ 146,538 $ 63,344 $ (59,707) $ 17,327 $ 16,195 $ 203,184 Average interest-earning assets $ 2,160,476 $ 4,037,398 $ 3,563,429 $ 5,684,108 $ 2,405,923 $ 441,720 $ 18,293,054 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Six-Month Period Ended June 30, 2024 Interest income $ 63,151 $ 209,900 $ 124,799 $ 56,970 $ 71,178 $ 14,752 $ 540,750 Net (charge) credit for transfer of funds (26,820) 136,520 (40,692) (83,665) (4,713) 19,370 - Interest expense - (77,429) (8,012) (25,061) (29,520) (4,580) (144,602) Net interest income (loss) 36,331 268,991 76,095 (51,756) 36,945 29,542 396,148 Provision for credit losses - (benefit) expense (10,098) 42,462 (5,010) (9) (3,442) (131) 23,772 Non-interest income 6,727 48,853 3,401 233 1,752 5,055 66,021 Non-interest expenses: Employees’ compensation and benefits 13,362 68,876 9,630 1,840 14,288 8,966 116,962 Occupancy and equipment 2,874 28,871 2,784 378 3,904 4,421 43,232 Business promotion 636 5,789 516 403 511 346 8,201 Professional fees 4,290 13,880 1,928 688 2,127 2,194 25,107 Taxes, other than income taxes 869 7,959 911 198 268 332 10,537 FDIC deposit insurance 1,008 1,880 1,610 - 533 387 5,418 Net (gain) loss on OREO operations (3,026) - (2,159) - 2 122 (5,061) Credit and debit processing expenses - 11,368 402 - 5 1,583 13,358 Other non-interest expenses (1) 1,489 13,049 3,018 1,190 1,295 1,810 21,851 Total non-interest expenses 21,502 151,672 18,640 4,697 22,933 20,161 239,605 Segment income (loss) $ 31,654 $ 123,710 $ 65,866 $ (56,211) $ 19,206 $ 14,567 $ 198,792 Average interest-earning assets $ 2,127,479 $ 4,006,806 $ 3,501,142 $ 5,871,437 $ 2,103,523 $ 416,140 $ 18,026,527 (1) Consists of communication expenses and the expense categories described in Note 19 - “Other Non-Interest Expenses,” to the audited consolidated financial statements included in the 2024 Annual Report on Form 10-K.
Reconciliation of the Reportable Segment Financial Information [Table Text Block]	The following table presents a reconciliation of the reportable segment financial information to the consolidated totals for the indicated periods: Quarter Ended June 30, Six-Month Period Ended June 30, 2025 2024 2025 2024 (In thousands) Average assets: Total average earning assets for segments $ 18,274,980 $ 18,029,894 $ 18,293,054 $ 18,026,527 Average non-earning assets (1) 766,226 854,537 780,918 844,838 Total consolidated average assets $ 19,041,206 $ 18,884,431 $ 19,073,972 $ 18,871,365 (1) Includes, among other things, non-interest-earning cash, premises and equipment, net deferred tax asset, ROU assets, and accrued interest receivable on loans and investments.