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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation Of Revenue [Line Items] |  |  |  |
Net interest income (loss) | $ 217,916 | $ 202,064 | $ 646,172 | $ 598,212
Service charges and fees on deposit accounts | 9,811 | 9,684 | 29,207 | 29,071
Insurance commission income | 2,618 | 3,003 | 10,961 | 11,296
Card and processing income | 11,682 | 11,768 | 35,037 | 34,603
Other non-interest income | 3,374 | 4,848 | 12,386 | 14,053
Total non-interest income | 30,794 | 32,502 | 97,478 | 98,523
Total Revenues (Loss) | 248,710 | 234,566 | 743,650 | 696,735
Other service charges and fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 2,159 | 2,731 | 6,372 | 8,268
Not in scope of Topic 606 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 4,524 | 5,316 | 15,901 | 15,285
Mortgage Banking Segment [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net interest income (loss) | 17,636 | 18,409 | 52,892 | 54,740
Service charges and fees on deposit accounts | 0 | 0 | 0 | 0
Insurance commission income | 0 | 0 | 0 | 0
Card and processing income | 0 | 0 | 0 | 0
Total non-interest income | 3,415 | 3,407 | 10,495 | 10,134
Total Revenues (Loss) | 21,051 | 21,816 | 63,387 | 64,874
Mortgage Banking Segment [Member] | Other service charges and fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 20 | 54 | 54 | 153
Mortgage Banking Segment [Member] | Not in scope of Topic 606 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 3,395 | 3,353 | 10,441 | 9,981
Consumer (Retail) Banking Segment [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net interest income (loss) | 147,907 | 140,014 | 436,824 | 409,005
Service charges and fees on deposit accounts | 7,419 | 7,833 | 22,099 | 23,117
Insurance commission income | 2,430 | 2,824 | 10,310 | 10,621
Card and processing income | 10,347 | 10,219 | 30,172 | 29,706
Total non-interest income | 22,330 | 23,912 | 70,887 | 72,765
Total Revenues (Loss) | 170,237 | 163,926 | 507,711 | 481,770
Consumer (Retail) Banking Segment [Member] | Other service charges and fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 1,695 | 1,649 | 4,996 | 5,218
Consumer (Retail) Banking Segment [Member] | Not in scope of Topic 606 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 439 | 1,387 | 3,310 | 4,103
Commercial and Corporate Segment [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net interest income (loss) | 44,076 | 40,124 | 128,941 | 116,219
Service charges and fees on deposit accounts | 1,506 | 949 | 4,434 | 3,228
Insurance commission income | 0 | 0 | 0 | 0
Card and processing income | 221 | 221 | 854 | 671
Total non-interest income | 1,898 | 1,671 | 6,050 | 5,072
Total Revenues (Loss) | 45,974 | 41,795 | 134,991 | 121,291
Commercial and Corporate Segment [Member] | Other service charges and fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 32 | 173 | 73 | 514
Commercial and Corporate Segment [Member] | Not in scope of Topic 606 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 139 | 328 | 689 | 659
Treasury and Investments Segment [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net interest income (loss) | (30,957) | (31,262) | (85,746) | (83,018)
Service charges and fees on deposit accounts | 0 | 0 | 0 | 0
Insurance commission income | 0 | 0 | 0 | 0
Card and processing income | 0 | 0 | 0 | 0
Total non-interest income | 33 | 250 | 203 | 483
Total Revenues (Loss) | (30,924) | (31,012) | (85,543) | (82,535)
Treasury and Investments Segment [Member] | Other service charges and fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 0 | 0 | 0 | 0
Treasury and Investments Segment [Member] | Not in scope of Topic 606 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 33 | 250 | 203 | 483
United States Operations Segment [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net interest income (loss) | 22,517 | 19,447 | 63,748 | 56,392
Service charges and fees on deposit accounts | 142 | 149 | 431 | 452
Insurance commission income | 65 | 75 | 158 | 161
Card and processing income | 23 | 10 | 76 | 119
Total non-interest income | 998 | 959 | 2,714 | 2,711
Total Revenues (Loss) | 23,515 | 20,406 | 66,462 | 59,103
United States Operations Segment [Member] | Other service charges and fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 289 | 698 | 856 | 1,932
United States Operations Segment [Member] | Not in scope of Topic 606 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 479 | 27 | 1,193 | 47
Virgin Islands Operations Segment [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net interest income (loss) | 16,737 | 15,332 | 49,513 | 44,874
Service charges and fees on deposit accounts | 744 | 753 | 2,243 | 2,274
Insurance commission income | 123 | 104 | 493 | 514
Card and processing income | 1,091 | 1,318 | 3,935 | 4,107
Total non-interest income | 2,120 | 2,303 | 7,129 | 7,358
Total Revenues (Loss) | 18,857 | 17,635 | 56,642 | 52,232
Virgin Islands Operations Segment [Member] | Other service charges and fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | 123 | 157 | 393 | 451
Virgin Islands Operations Segment [Member] | Not in scope of Topic 606 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other non-interest income | $ 39 | $ (29) | $ 65 | $ 12

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