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ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Decrease in allowance for credit losses |  | $ 8,400 |  |
Provision for credit losses |  | 60,638 | $ 24,119 | $ 221
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff (recovery) |  | (51,800) |  |
Increase (decrease) in net charge-offs |  | (24,200) |  |
PCD |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  | 3,902 | 2,250 | 33,559
Recoveries |  | 3,054 | 7,220 | 5,877
Provision for (recapture of) credit losses |  | (1,488) | (18,010) | 7,760
Qualitative Reserve |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for credit losses |  | 4,800 |  |
Commercial loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for credit losses |  | 13,100 |  |
Increase (decrease) in net charge-offs |  | (6,000) |  |
Charge-offs |  | 14,191 |  |
Commercial loans | PCD |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  | 2,794 | $ 69 | 12,241
Number of commercial loans | loan |  |  | 4 |
Number of commercial loans sold | loan |  |  | 2 |
Recoveries | $ 1,100 | 1,618 | $ 3,804 | 2,929
Provision for (recapture of) credit losses |  | 901 | (6,855) | (2,585)
Commercial loans | PCD | Loans Held For Sale |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  |  |  | 30,100
Recoveries |  |  |  | 9,700
Provision for (recapture of) credit losses |  |  |  | 20,400
Commercial loans | PCD | Loans Sold |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  |  | 12,300 |
Commercial loans | PCD | Puerto Rico |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Recoveries | $ 2,800 |  |  |
Commercial loans | US commercial loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  | 10,500 |  |
Commercial loans | Small business commercial loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  | 906 |  |
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Increase (decrease) in net charge-offs |  | (8,000) |  |
Charge-offs |  | 23,655 |  |
Consumer | PCD |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  | 621 | 176 | 22
Recoveries |  | 96 | 94 | 316
Provision for (recapture of) credit losses |  | 518 | 62 | (317)
Mortgage loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Increase (decrease) in net charge-offs |  | (3,200) |  |
Charge-offs |  | 759 |  |
Mortgage loans | PCD |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  | 317 | 1,695 | 20,350
Recoveries |  | 698 | 2,665 | 1,423
Provision for (recapture of) credit losses |  | (2,389) | (10,629) | 11,556
Auto loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Increase (decrease) in net charge-offs |  | (7,000) |  |
Charge-offs |  | 43,764 |  |
Auto loans | PCD |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Charge-offs |  | 170 | 310 | 946
Recoveries |  | 642 | 657 | 1,209
Provision for (recapture of) credit losses |  | (518) | $ (588) | $ (894)
Consumer And Automobile And Leasing Portfolio Segments |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Recoveries |  | 3,700 |  |
Financing Receivable, Loan Growth Member |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for credit losses |  | $ 42,600 |  |

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