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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 02, 2021
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure      
Exposure Municipal Loans And Securities   75.00%  
Loans And Leases Receivable Gross Carrying Amount   $ 29,506,225 $ 29,588,430
Commitments To Extend Credit      
Commitments and Contingencies Disclosure      
Reserve of potential losses associated with unfunded loan commitments   7,900 15,900
Noncredit commitment      
Commitments and Contingencies Disclosure      
Investments   1,000 1,400
Residential mortgage loans      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount   1,600,000 1,800,000
SBA loans under PPP program      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount   353,000 1,300,000
BVI | Retail and commerical loans      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount   221,000 251,000
BVI | Loan with BVI government      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount     19,000
Insured or guaranteed by the U.S. Government or its agencies | Commercial Loans      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount   67,000 60,000
PR Government direct exposure      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   348,588 377,000
Total concentration of risk   366,777  
Principal payments received $ 32,000    
PR Government direct exposure | Loans      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   318,390 342,000
PR Government direct exposure | Loans | Adjustment rounding      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   319,000  
PR Government direct exposure | Securities Investment      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   30,198 35,000
PR Government Indirect Exposure      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   275,000 317,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA   232,000 260,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   43,000 46,000
USVI Government Direct Exposure | From USVI Government And Public Corporations      
Commitments and Contingencies Disclosure      
Total concentration of risk   $ 70,000 $ 105,000