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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Commitments and Contingencies Disclosure [Line Items]              
Loans And Leases Receivable Gross Carrying Amount $ 38,611,834,000       $ 38,611,834,000   $ 37,522,995,000
FDIC deposit insurance expense 9,407,000 $ 10,581,000     19,442,000 $ 34,468,000  
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 13,000,000       13,000,000   15,000,000
Noncredit commitment              
Commitments and Contingencies Disclosure [Line Items]              
Investments 2,000,000       2,000,000   2,000,000
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 194,000,000       194,000,000   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 83,100,000       83,100,000   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 2,300,000,000       2,300,000,000   2,100,000,000
PR Government direct exposure              
Commitments and Contingencies Disclosure [Line Items]              
Total concentration of risk         411,634,000   336,000,000
Outstanding concentration of risk $ 362,234,000       $ 362,234,000   336,000,000
Exposure Municipal Loans And Securities 81.00%       81.00%    
PR Government direct exposure | Loans              
Commitments and Contingencies Disclosure [Line Items]              
Outstanding concentration of risk $ 351,111,000       $ 351,111,000   323,000,000
PR Government direct exposure | Securities Investment              
Commitments and Contingencies Disclosure [Line Items]              
Outstanding concentration of risk 11,123,000       11,123,000   13,000,000
PR Government Indirect Exposure              
Commitments and Contingencies Disclosure [Line Items]              
Outstanding concentration of risk 212,000,000       212,000,000   220,000,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA 168,000,000       168,000,000   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 $ 37,000,000       37,000,000   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