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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 02, 2021
Jun. 30, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure      
Exposure Municipal Loans And Securities   74.00%  
Loans And Leases Receivable Gross Carrying Amount   $ 29,286,225 $ 29,588,430
Commitments To Extend Credit      
Commitments and Contingencies Disclosure      
Reserve of potential losses associated with unfunded loan commitments   10,000 16,000
Noncredit commitment      
Commitments and Contingencies Disclosure      
Investments   1,400 1,400
Residential mortgage loans      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount   1,700,000 1,800,000
SBA loans under PPP program      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount   1,000,000 1,300,000
BVI | Retail and commerical loans      
Commitments and Contingencies Disclosure      
Loans And Leases Receivable Gross Carrying Amount   228,000 251,000
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   63,000 60,000
PR Government direct exposure      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   374,573  
Total concentration of risk   374,573  
PR Government direct exposure | Subsequent event      
Commitments and Contingencies Disclosure      
Principal payments received $ 32,000    
PR Government direct exposure | Loans      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   341,925 342,000
PR Government direct exposure | Securities Investment      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   32,648 35,000
PR Government direct exposure | PR government and its instrumentalities and municipalities      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   375,000 377,000
PR Government Indirect Exposure      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   302,000 317,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA   248,000 260,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   44,000 46,000
PR Government Indirect Exposure | Commercial real estate      
Commitments and Contingencies Disclosure      
Outstanding concentration of risk   10,000 11,000
USVI Government Direct Exposure | From USVI Government And Public Corporations      
Commitments and Contingencies Disclosure      
Total concentration of risk   $ 73,000 $ 105,000