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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Commitments and Contingencies Disclosure    
Loans And Leases Receivable Gross Carrying Amount $ 29,856,356 $ 29,506,225
Commitments to extend credit    
Commitments and Contingencies Disclosure    
Reserve of potential losses associated with unfunded loan commitments 7,100 7,900
Noncredit commitment    
Commitments and Contingencies Disclosure    
Investments 1,000 1,000
Residential mortgage loans    
Commitments and Contingencies Disclosure    
Loans And Leases Receivable Gross Carrying Amount 1,600,000 1,600,000
SBA loans under PPP program    
Commitments and Contingencies Disclosure    
Loans And Leases Receivable Gross Carrying Amount 173,000 353,000
BVI | Retail and commerical loans    
Commitments and Contingencies Disclosure    
Loans And Leases Receivable Gross Carrying Amount 218,000 221,000
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 67,000
PR Government direct exposure    
Commitments and Contingencies Disclosure    
Outstanding concentration of risk 345,598 349,000
Total concentration of risk 363,787 367,000
PR Government direct exposure | Loans    
Commitments and Contingencies Disclosure    
Outstanding concentration of risk $ 318,301 319,000
Exposure Municipal Loans And Securities 75.00%  
PR Government direct exposure | Loans | Adjustment    
Commitments and Contingencies Disclosure    
Outstanding concentration of risk $ 319,000  
PR Government direct exposure | Securities Investment    
Commitments and Contingencies Disclosure    
Outstanding concentration of risk 27,297 30,000
PR Government Indirect Exposure    
Commitments and Contingencies Disclosure    
Outstanding concentration of risk 268,000 275,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA 225,000 232,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans    
Commitments and Contingencies Disclosure    
Outstanding concentration of risk 43,000 43,000
USVI Government Direct Exposure | From USVI Government And Public Corporations    
Commitments and Contingencies Disclosure    
Total concentration of risk $ 70,000 $ 70,000