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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | $ 37,675,070 |  |  | $ 37,522,995
FDIC deposit insurance expense | 10,035 | $ 23,887 |  |
FDIC Special Assessment |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
FDIC Indemnification Asset |  | 20,400,000 | $ 16,300,000 |
FDIC deposit insurance expense |  | 14,300 | 71,400 |
FDIC deposit insurance expense net of tax |  | $ 9,100 | $ 45,300 |
Commitments to extend credit |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Reserve of potential losses associated with unfunded loan commitments | 14,000 |  |  | 15,000
Noncredit commitment |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Investments | 2,000 |  |  | 2,000
BVI | Retail and commerical loans |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 196,000 |  |  | 196,000
Insured or guaranteed by the U.S. Government or its agencies | Commercial Loans |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 86,500 |  |  | 87,400
Insured or guaranteed by the U.S. Government or its agencies | Residential mortgage loans |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 2,200,000 |  |  | 2,100,000
PR Government direct exposure |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Total concentration of risk | 362,236 |  |  | 336,000
Outstanding concentration of risk | $ 362,236 |  |  | 336,000
Exposure Municipal Loans And Securities | 81.00% |  |  |
PR Government direct exposure | Loans |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Outstanding concentration of risk | $ 351,111 |  |  | 323,000
PR Government direct exposure | Securities Investment |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Outstanding concentration of risk | 11,125 |  |  | 13,000
PR Government Indirect Exposure |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Outstanding concentration of risk | 216,000 |  |  | 220,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA | 172,000 |  |  | 176,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Outstanding concentration of risk | 37,000 |  |  | 38,000
USVI Government Direct Exposure | From USVI Government And Public Corporations |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Total concentration of risk | $ 28,000 |  |  | $ 28,000

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