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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Increase (decrease) in ACL | $ 1,800 |  |  |
Provision for credit losses - (benefit) expense | 12,917 | $ 16,256 |  |
Net charge-offs | 11,200 | 13,300 |  |
Increase (decrease) in net charge-offs | (2,100) |  |  |
Recoveries | 18,171 | 4,648 |  |
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) | 281 | (105) |  |
Off-Balance Sheet, Credit Loss, Liability | 4,919 | 4,168 | $ 4,638 | $ 4,273
Charge-offs | 29,339 | 17,917 |  |
Net disbursements on loans held for investment | 156,118 | 71,193 |  |
Residential Portfolio Segment [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Increase (decrease) in ACL | (700) |  |  |
Provision for credit losses - (benefit) expense | (464) | 73 |  |
Recoveries | 272 | 497 |  |
Charge-offs | 516 | 983 |  |
Residential Portfolio Segment [Member] | U S [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Charge-offs | 0 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Increase (decrease) in ACL |  |  | 1,900 |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | (3,360) | (1,650) |  |
Recoveries | 5,119 | 90 |  |
Charge-offs | 459 | 118 |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | 571 | 860 |  |
Recoveries | 10 | 63 |  |
Charge-offs | 0 | 0 |  |
Commercial Portfolio Segment [Member] | U S [Member] | Commercial And Industrial Sector [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Charge-offs | 307 |  |  |
Commercial Portfolio Segment [Member] | U S [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Charge-offs | 0 |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Commercial And Industrial Sector [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Recoveries | 5,000 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | (10) | 1,246 |  |
Recoveries | 40 | 168 |  |
Charge-offs | 0 | 18 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | U S [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Charge-offs | 0 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Increase (decrease) in ACL |  |  | $ 600 |
Provision for credit losses - (benefit) expense | 16,180 | 15,727 |  |
Recoveries | 12,730 | 3,830 |  |
Charge-offs | 28,364 | $ 16,798 |  |
Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Charge-offs | 9,415 |  |  |
Consumer Portfolio Segment [Member] | Bulk Sale Of Nonaccrual Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Recoveries | 9,500 |  |  |
Consumer Portfolio Segment [Member] | U S [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Charge-offs | 59 |  |  |
Consumer Portfolio Segment [Member] | U S [Member] | Automobile Loan [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Charge-offs | $ 59 |  |  |

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