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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | $ 39,111,956,000 |  |  |  | $ 39,111,956,000 |  | $ 37,522,995,000
FDIC deposit insurance expense | 10,873,000 | $ 10,433,000 |  |  | 30,315,000 | $ 44,901,000 |
Maximum Automated Clearing House (ACH) transaction settlement exposure | 47,400,000 |  |  |  | 47,400,000 |  |
FDIC Special Assessment |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
FDIC deposit insurance expense |  |  | $ 14,300,000 | $ 71,400,000 |  |  |
FDIC deposit insurance expense net of tax |  |  | $ 9,100,000 | $ 45,300,000 |  |  |
Commitments to extend credit |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Reserve of potential losses associated with unfunded loan commitments | 14,000,000 |  |  |  | 14,000,000 |  | 15,000,000
Noncredit commitment |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Investments | 6,000,000 |  |  |  | 6,000,000 |  | 6,000,000
BVI |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Total concentration of risk |  |  |  |  | 0 |  |
BVI | Retail and commerical loans |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 193,000,000 |  |  |  | 193,000,000 |  | 196,000,000
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 | 80,900,000 |  |  |  | 80,900,000 |  | 87,400,000
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 | 2,400,000,000 |  |  |  | 2,400,000,000 |  | 2,100,000,000
PR Government direct exposure |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Total concentration of risk |  |  |  |  | 391,323,000 |  | 336,000,000
Outstanding concentration of risk | $ 341,923,000 |  |  |  | $ 341,923,000 |  | 336,000,000
Exposure Municipal Loans And Securities | 76.00% |  |  |  | 76.00% |  |
PR Government direct exposure | Loans |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Outstanding concentration of risk | $ 333,167,000 |  |  |  | $ 333,167,000 |  | 323,000,000
PR Government direct exposure | Securities Investment |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Outstanding concentration of risk | 8,756,000 |  |  |  | 8,756,000 |  | 13,000,000
PR Government Indirect Exposure |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Outstanding concentration of risk | 208,000,000 |  |  |  | 208,000,000 |  | 220,000,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA | 165,000,000 |  |  |  | 165,000,000 |  | 176,000,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Outstanding concentration of risk | $ 36,000,000 |  |  |  | 36,000,000 |  | 38,000,000
USVI Government Direct Exposure | From USVI Government And Public Corporations |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Total concentration of risk |  |  |  |  | $ 28,000,000 |  | $ 28,000,000

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