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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 24, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount |  | $ 36,599,612 |  | $ 35,420,879 |  | $ 36,599,612 |  | $ 35,420,879
FDIC deposit insurance expense |  | 10,433 |  |  | $ 8,932 | 44,901 | $ 24,600 |
FDIC Special Assessment |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
FDIC Indemnification Asset |  |  | $ 20,400,000 | 16,300,000 |  |  |  | 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 |  | 18,000 |  | 17,000 |  | 18,000 |  | 17,000
Noncredit commitment |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Investments |  | 2,000 |  | 3,300 |  | 2,000 |  | 3,300
Residential mortgage loans |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount |  | 2,000,000 |  | 1,900,000 |  | 2,000,000 |  | 1,900,000
BVI | Retail and commerical loans |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount |  | 200,000 |  | 205,000 |  | 200,000 |  | 205,000
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 |  | 88,400 |  | 89,200 |  | 88,400 |  | 89,200
PR Government direct exposure |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Total concentration of risk |  |  |  |  |  | 336,113 |  | 362,000
Outstanding concentration of risk |  | $ 336,113 |  | 333,000 |  | $ 336,113 |  | 333,000
Exposure Municipal Loans And Securities |  | 80.00% |  |  |  | 80.00% |  |
Principal payment from various obligations | $ 40,000 |  |  |  |  |  |  |
PR Government direct exposure | Loans |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Outstanding concentration of risk |  | $ 323,452 |  |  |  | $ 323,452 |  |
PR Government direct exposure | Loans | Adjustment |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Outstanding concentration of risk |  | 323,000 |  | 314,000 |  | 323,000 |  | 314,000
PR Government direct exposure | Securities Investment |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Outstanding concentration of risk |  | 12,661 |  | 19,000 |  | 12,661 |  | 19,000
PR Government Indirect Exposure |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Outstanding concentration of risk |  | 225,000 |  | 238,000 |  | 225,000 |  | 238,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA |  | 179,000 |  | 191,000 |  | 179,000 |  | 191,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Outstanding concentration of risk |  | $ 38,000 |  | $ 40,000 |  | 38,000 |  | 40,000
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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