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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 24, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Commitments and Contingencies Disclosure [Line Items]                
Loans And Leases Receivable Gross Carrying Amount   $ 35,978,602   $ 35,420,879   $ 35,978,602   $ 35,420,879
FDIC deposit insurance expense   10,581     $ 6,803 34,468 $ 15,668  
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        
Subsequent event | Obligations from Puerto Rico municipalities                
Commitments and Contingencies Disclosure [Line Items]                
Principal payment from various obligations $ 40,000              
Commitments to extend credit                
Commitments and Contingencies Disclosure [Line Items]                
Reserve of potential losses associated with unfunded loan commitments   18,900   17,000   18,900   17,000
Noncredit commitment                
Commitments and Contingencies Disclosure [Line Items]                
Investments   3,200   3,300   3,200   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   201,000   205,000   201,000   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   90,900   89,200   90,900   89,200
PR Government direct exposure                
Commitments and Contingencies Disclosure [Line Items]                
Total concentration of risk   376,114           362,000
Outstanding concentration of risk   $ 376,114   333,000   $ 376,114   333,000
Exposure Municipal Loans And Securities   79.00%       79.00%    
PR Government direct exposure | Loans                
Commitments and Contingencies Disclosure [Line Items]                
Outstanding concentration of risk   $ 360,548   314,000   $ 360,548   314,000
PR Government direct exposure | Loans | Adjustment                
Commitments and Contingencies Disclosure [Line Items]                
Outstanding concentration of risk   360,000       360,000    
PR Government direct exposure | Securities Investment                
Commitments and Contingencies Disclosure [Line Items]                
Outstanding concentration of risk   15,566   19,000   15,566   19,000
PR Government Indirect Exposure                
Commitments and Contingencies Disclosure [Line Items]                
Outstanding concentration of risk   229,000   238,000   229,000   238,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA   183,000   191,000   183,000   191,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans                
Commitments and Contingencies Disclosure [Line Items]                
Outstanding concentration of risk   39,000   $ 40,000   $ 39,000   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