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SEGMENT INFORMATION - Information by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 1,095,153 | $ 1,023,486 | $ 862,614
Interest expense | (287,674) | (226,376) | (67,321)
Net interest income (loss) | 807,479 | 797,110 | 795,293
Provision for credit losses - (benefit) expense | 59,921 | 60,940 | 27,696
Non-interest income | 130,722 | 132,694 | 123,092
Employees' compensation and benefits | 235,695 | 222,855 | 206,038
Occupancy and equipment | 88,427 | 85,911 | 88,277
Business promotion | 17,645 | 19,626 | 18,231
Professional fees | 49,455 | 45,841 | 47,848
Taxes, other than income taxes | 22,196 | 21,236 | 20,267
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 9,818 | 14,873 | 6,149
Net (gain) loss on OREO operations | (7,474) | (7,138) | (5,826)
Credit and debit card processing expenses | 27,600 | 25,997 | 22,736
Other non-interest expenses | 34,932 | 33,666 | 30,662
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 1,095,153 | 1,023,486 | 862,614
Net (charge) credit for transfer of funds | 0 | 0 | 0
Interest expense | (287,674) | (226,376) | (67,321)
Net interest income (loss) | 807,479 | 797,110 | 795,293
Provision for credit losses - (benefit) expense | 59,921 | 60,940 | 27,696
Non-interest income | 130,722 | 132,694 | 123,092
Employees' compensation and benefits | 235,695 | 222,855 | 206,038
Occupancy and equipment | 88,427 | 85,911 | 88,277
Business promotion | 17,645 | 19,626 | 18,231
Professional fees | 49,455 | 45,841 | 47,848
Taxes, other than income taxes | 22,196 | 21,236 | 20,267
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 9,818 | 14,873 | 6,149
Net (gain) loss on OREO operations | (7,474) | (7,138) | (5,826)
Credit and debit card processing expenses | 27,600 | 25,997 | 22,736
Other non-interest expenses | 43,711 | 42,227 | 39,385
Direct non-interest expenses | 487,073 | 471,428 | 443,105
Segment income (loss) | 391,207 | 397,436 | 447,584
Average earnings assets | 18,126,256 | 17,866,846 | 18,517,104
Mortgage Banking Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 72,455 | 75,774 | 78,098
Non-interest income | 13,507 | 11,213 | 15,698
Mortgage Banking Segment [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 127,189 | 127,154 | 130,844
Net (charge) credit for transfer of funds | (54,734) | (51,380) | (52,746)
Interest expense | 0 | 0 | 0
Net interest income (loss) | 72,455 | 75,774 | 78,098
Provision for credit losses - (benefit) expense | (15,526) | (7,908) | (7,936)
Non-interest income | 13,507 | 11,213 | 15,698
Employees' compensation and benefits | 27,144 | 25,463 | 24,460
Occupancy and equipment | 5,858 | 6,015 | 6,647
Business promotion | 1,264 | 1,446 | 1,371
Professional fees | 7,638 | 7,054 | 7,716
Taxes, other than income taxes | 1,808 | 1,382 | 964
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 1,832 | 2,879 | 1,346
Net (gain) loss on OREO operations | (5,553) | (7,305) | (6,391)
Credit and debit card processing expenses | 0 | 0 | 0
Other non-interest expenses | 2,994 | 2,968 | 2,802
Direct non-interest expenses | 42,985 | 39,902 | 38,915
Segment income (loss) | 58,503 | 54,993 | 62,817
Average earnings assets | 2,134,551 | 2,149,445 | 2,240,946
Consumer (Retail) Banking Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 550,820 | 484,306 | 463,203
Non-interest income | 96,239 | 92,608 | 88,857
Consumer (Retail) Banking Segment [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 423,738 | 390,619 | 331,558
Net (charge) credit for transfer of funds | 284,065 | 214,392 | 161,946
Interest expense | (156,983) | (120,705) | (30,301)
Net interest income (loss) | 550,820 | 484,306 | 463,203
Provision for credit losses - (benefit) expense | 95,315 | 66,072 | 54,934
Non-interest income | 96,239 | 92,608 | 88,857
Employees' compensation and benefits | 139,176 | 133,422 | 120,356
Occupancy and equipment | 59,478 | 58,000 | 58,036
Business promotion | 12,331 | 13,787 | 12,754
Professional fees | 27,618 | 25,251 | 25,120
Taxes, other than income taxes | 16,702 | 16,891 | 17,105
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 3,415 | 5,043 | 1,983
Net (gain) loss on OREO operations | (51) | (58) | 27
Credit and debit card processing expenses | 23,620 | 22,258 | 19,452
Other non-interest expenses | 26,159 | 25,878 | 23,644
Direct non-interest expenses | 308,448 | 300,472 | 278,477
Segment income (loss) | 243,296 | 210,370 | 218,649
Average earnings assets | 4,042,201 | 3,770,393 | 3,372,309
Commercial and Corporate Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 157,672 | 142,313 | 143,776
Non-interest income | 6,996 | 11,053 | 7,274
Commercial and Corporate Segment [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 251,899 | 229,217 | 177,526
Net (charge) credit for transfer of funds | (78,291) | (71,813) | (30,130)
Interest expense | (15,936) | (15,091) | 3,620
Net interest income (loss) | 157,672 | 142,313 | 143,776
Provision for credit losses - (benefit) expense | (12,928) | (5,997) | (17,759)
Non-interest income | 6,996 | 11,053 | 7,274
Employees' compensation and benefits | 19,538 | 17,426 | 16,841
Occupancy and equipment | 5,725 | 4,987 | 5,449
Business promotion | 1,166 | 1,218 | 1,061
Professional fees | 4,022 | 3,501 | 3,990
Taxes, other than income taxes | 2,107 | 1,272 | 816
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 2,926 | 4,311 | 1,793
Net (gain) loss on OREO operations | (2,483) | 96 | 610
Credit and debit card processing expenses | 764 | 1,457 | 1,292
Other non-interest expenses | 5,956 | 5,332 | 4,619
Direct non-interest expenses | 39,721 | 39,600 | 36,471
Segment income (loss) | 137,875 | 119,763 | 132,338
Average earnings assets | 3,518,554 | 3,299,209 | 3,165,020
Treasury and Investments Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | (112,151) | (31,944) | (13,964)
Non-interest income | 455 | 2,125 | (161)
Treasury and Investments Segment [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 116,734 | 116,382 | 102,991
Net (charge) credit for transfer of funds | (184,627) | (111,433) | (96,178)
Interest expense | (44,258) | (36,893) | (20,777)
Net interest income (loss) | (112,151) | (31,944) | (13,964)
Provision for credit losses - (benefit) expense | (50) | 20 | (434)
Non-interest income | 455 | 2,125 | (161)
Employees' compensation and benefits | 3,648 | 3,354 | 3,168
Occupancy and equipment | 739 | 717 | 814
Business promotion | 727 | 881 | 901
Professional fees | 1,313 | 654 | 1,292
Taxes, other than income taxes | 407 | 425 | 370
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 0 | 0 | 0
Net (gain) loss on OREO operations | 0 | 0 | 0
Credit and debit card processing expenses | 0 | 0 | 0
Other non-interest expenses | 2,363 | 2,562 | 2,451
Direct non-interest expenses | 9,197 | 8,593 | 8,996
Segment income (loss) | (120,843) | (38,432) | (22,687)
Average earnings assets | 5,850,884 | 6,186,018 | 7,300,208
United States Operations Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 77,988 | 70,798 | 74,168
Non-interest income | 3,589 | 6,839 | 3,006
United States Operations Segment [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 146,637 | 132,490 | 94,782
Net (charge) credit for transfer of funds | (7,215) | (12,830) | (9,065)
Interest expense | (61,434) | (48,862) | (11,549)
Net interest income (loss) | 77,988 | 70,798 | 74,168
Provision for credit losses - (benefit) expense | (6,661) | 8,687 | (3,073)
Non-interest income | 3,589 | 6,839 | 3,006
Employees' compensation and benefits | 28,203 | 25,960 | 24,626
Occupancy and equipment | 7,607 | 6,959 | 7,141
Business promotion | 1,280 | 1,221 | 1,104
Professional fees | 4,383 | 4,300 | 4,472
Taxes, other than income taxes | 503 | 552 | 419
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 962 | 1,524 | 565
Net (gain) loss on OREO operations | (4) | (150) | (172)
Credit and debit card processing expenses | 10 | 10 | 11
Other non-interest expenses | 2,640 | 2,393 | 2,531
Direct non-interest expenses | 45,584 | 42,769 | 40,697
Segment income (loss) | 42,654 | 26,181 | 39,550
Average earnings assets | 2,176,701 | 2,072,292 | 2,069,030
Virgin Islands Operations Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 60,695 | 55,863 | 50,012
Non-interest income | 9,936 | 8,856 | 8,418
Virgin Islands Operations Segment [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 28,956 | 27,624 | 24,913
Net (charge) credit for transfer of funds | 40,802 | 33,064 | 26,173
Interest expense | (9,063) | (4,825) | (1,074)
Net interest income (loss) | 60,695 | 55,863 | 50,012
Provision for credit losses - (benefit) expense | (229) | 66 | 1,964
Non-interest income | 9,936 | 8,856 | 8,418
Employees' compensation and benefits | 17,986 | 17,230 | 16,587
Occupancy and equipment | 9,020 | 9,233 | 10,190
Business promotion | 877 | 1,073 | 1,040
Professional fees | 4,481 | 5,081 | 5,258
Taxes, other than income taxes | 669 | 714 | 593
Federal Deposit Insurance Corporation (FDIC) deposit insurance | 683 | 1,116 | 462
Net (gain) loss on OREO operations | 617 | 279 | 100
Credit and debit card processing expenses | 3,206 | 2,272 | 1,981
Other non-interest expenses | 3,599 | 3,094 | 3,338
Direct non-interest expenses | 41,138 | 40,092 | 39,549
Segment income (loss) | 29,722 | 24,561 | 16,917
Average earnings assets | $ 403,365 | $ 389,489 | $ 369,591

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