SEGMENT INFORMATION (Tables)	9 Months Ended
SEGMENT INFORMATION (Tables)	Sep. 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 September 30, 2025: Interest income $ 32,512 $ 105,915 $ 63,299 $ 31,977 $ 40,946 $ 8,094 $ 282,743 Net (charge) credit for transfer of funds (14,876) 80,087 (15,485) (58,473) (1,840) 10,587 - Interest expense - (38,095) (3,738) (4,461) (16,589) (1,944) (64,827) Net interest income (loss) 17,636 147,907 44,076 (30,957) 22,517 16,737 217,916 Provision for credit losses - (benefit) expense (2,037) 18,280 728 146 41 435 17,593 Non-interest income 3,415 22,330 1,898 33 998 2,120 30,794 Non-interest expenses: Employees’ compensation and benefits 6,659 35,865 4,647 1,035 7,039 4,516 59,761 Occupancy and equipment 1,434 14,923 1,457 176 1,840 2,355 22,185 Business promotion 227 2,765 252 172 276 192 3,884 Professional fees 1,636 6,698 927 319 1,151 1,172 11,903 Taxes, other than income taxes 481 4,573 653 112 105 168 6,092 FDIC deposit insurance 414 760 680 - 240 142 2,236 Net (gain) loss on OREO operations (1,406) - (492) - - 2,931 1,033 Credit and debit card processing expenses - 6,971 217 - 3 698 7,889 Other non-interest expenses (1) 851 6,621 558 273 717 891 9,911 Total non-interest expenses 10,296 79,176 8,899 2,087 11,371 13,065 124,894 Segment income (loss) $ 12,792 $ 72,781 $ 36,347 $ (33,157) $ 12,103 $ 5,357 $ 106,223 Average interest-earning assets $ 2,172,385 $ 4,019,262 $ 3,639,505 $ 5,361,692 $ 2,584,121 $ 462,264 $ 18,239,229 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Quarter ended September 30, 2024: Interest income $ 32,200 $ 106,864 $ 63,476 $ 28,099 $ 37,049 $ 6,987 $ 274,675 Net (charge) credit for transfer of funds (13,791) 73,064 (19,519) (48,315) (2,187) 10,748 - Interest expense - (39,914) (3,833) (11,046) (15,415) (2,403) (72,611) Net interest income (loss) 18,409 140,014 40,124 (31,262) 19,447 15,332 202,064 Provision for credit losses - (benefit) expense (5,175) 28,514 (6,842) (36) (1,010) (206) 15,245 Non-interest income 3,407 23,912 1,671 250 959 2,303 32,502 Non-interest expenses: Employees’ compensation and benefits 6,734 34,806 4,879 926 7,204 4,532 59,081 Occupancy and equipment 1,501 15,049 1,457 193 1,913 2,311 22,424 Business promotion 307 2,904 256 165 258 226 4,116 Professional fees 1,600 7,190 1,112 303 1,192 1,141 12,538 Taxes, other than income taxes 454 4,244 578 109 120 160 5,665 FDIC deposit insurance 405 756 647 - 208 148 2,164 Net (gain) loss on OREO operations (1,350) - (88) - (6) 105 (1,339) Credit and debit card processing expenses - 6,111 180 - 2 802 7,095 Other non-interest expenses (1) 715 6,881 1,468 584 703 840 11,191 Total non-interest expenses 10,366 77,941 10,489 2,280 11,594 10,265 122,935 Segment income (loss) $ 16,625 $ 57,471 $ 38,148 $ (33,256) $ 9,822 $ 7,576 $ 96,386 Average interest-earning assets $ 2,134,706 $ 4,064,048 $ 3,487,762 $ 5,790,707 $ 2,172,677 $ 386,687 $ 18,036,587 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) Nine-Month Period Ended September 30, 2025 Interest income $ 96,906 $ 316,911 $ 186,590 $ 97,760 $ 116,503 $ 23,328 $ 837,998 Net (charge) credit for transfer of funds (44,014) 234,334 (46,524) (170,370) (5,381) 31,955 - Interest expense - (114,421) (11,125) (13,136) (47,374) (5,770) (191,826) Net interest income (loss) 52,892 436,824 128,941 (85,746) 63,748 49,513 646,172 Provision for credit losses - (benefit) expense (1,010) 55,503 4,083 138 2,905 1,371 62,990 Non-interest income 10,495 70,887 6,050 203 2,714 7,129 97,478 Non-interest expenses: Employees’ compensation and benefits 20,393 107,889 15,403 3,202 21,306 13,763 181,956 Occupancy and equipment 4,447 44,886 4,591 529 5,651 7,008 67,112 Business promotion 696 7,487 686 522 778 488 10,657 Professional fees 4,668 19,564 2,966 1,028 3,185 3,587 34,998 Taxes, other than income taxes 1,398 13,260 1,834 344 326 520 17,682 FDIC deposit insurance 1,246 2,308 2,021 - 714 418 6,707 Net (gain) loss on OREO operations (3,342) - (311) - - 2,966 (687) Credit and debit processing expenses - 17,818 691 - 8 2,229 20,746 Other non-interest expenses (1) 2,612 19,677 3,336 1,558 2,159 2,740 32,082 Total non-interest expenses 32,118 232,889 31,217 7,183 34,127 33,719 371,253 Segment income (loss) $ 32,279 $ 219,319 $ 99,691 $ (92,864) $ 29,430 $ 21,552 $ 309,407 Average interest-earning assets $ 2,164,489 $ 4,031,285 $ 3,589,066 $ 5,575,455 $ 2,465,975 $ 448,643 $ 18,274,913 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Nine-Month Period Ended September 30, 2024 Interest income $ 95,351 $ 316,764 $ 188,275 $ 85,069 $ 108,227 $ 21,739 $ 815,425 Net (charge) credit for transfer of funds (40,611) 209,584 (60,211) (131,980) (6,900) 30,118 - Interest expense - (117,343) (11,845) (36,107) (44,935) (6,983) (217,213) Net interest income (loss) 54,740 409,005 116,219 (83,018) 56,392 44,874 598,212 Provision for credit losses - (benefit) expense (15,273) 70,976 (11,852) (45) (4,452) (337) 39,017 Non-interest income 10,134 72,765 5,072 483 2,711 7,358 98,523 Non-interest expenses: Employees’ compensation and benefits 20,096 103,682 14,509 2,766 21,492 13,498 176,043 Occupancy and equipment 4,375 43,920 4,241 571 5,817 6,732 65,656 Business promotion 943 8,693 772 568 769 572 12,317 Professional fees 5,890 21,070 3,040 991 3,319 3,335 37,645 Taxes, other than income taxes 1,323 12,203 1,489 307 388 492 16,202 FDIC deposit insurance 1,413 2,636 2,257 - 741 535 7,582 Net (gain) loss on OREO operations (4,376) - (2,247) - (4) 227 (6,400) Credit and debit processing expenses - 17,479 582 - 7 2,385 20,453 Other non-interest expenses (1) 2,204 19,930 4,486 1,774 1,998 2,650 33,042 Total non-interest expenses 31,868 229,613 29,129 6,977 34,527 30,426 362,540 Segment income (loss) $ 48,279 $ 181,181 $ 104,014 $ (89,467) $ 29,028 $ 22,143 $ 295,178 Average interest-earning assets $ 2,129,905 $ 4,026,020 $ 3,496,657 $ 5,844,331 $ 2,126,742 $ 406,252 $ 18,029,907 (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 September 30, Nine-Month Period Ended September 30, 2025 2024 2025 2024 (In thousands) Average assets: Total average interest-earning assets for segments $ 18,239,229 $ 18,036,587 $ 18,274,913 $ 18,029,907 Average non-interest-earning assets (1) 789,563 846,787 783,834 845,490 Total consolidated average assets $ 19,028,792 $ 18,883,374 $ 19,058,747 $ 18,875,397 (1) Includes, among other things, non-interest-earning cash, premises and equipment, net deferred tax asset, right-of-use (“ROU”) assets, and accrued interest receivable on loans and investments.