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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Jul. 01, 2020
Jul. 01, 2019
Sep. 30, 2020
Jan. 02, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure          
Exposure Municipal Loans And Securities     74.00%    
Loans held-in-portfolio     $ 29,586,348   $ 27,587,856
BVI          
Commitments and Contingencies Disclosure          
Loans held-in-portfolio     253,000    
Commitments To Extend Credit          
Commitments and Contingencies Disclosure          
Reserve of potential losses associated with unfunded loan commitments     13,000   9,000
Noncredit commitment          
Commitments and Contingencies Disclosure          
Investments     2,100   2,500
PR Government direct exposure          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk     370,329    
Total concentration of risk     370,329    
Principal payments received $ 58,000 $ 22,000      
PR Government direct exposure | Loans          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk     334,955   391,000
PR Government direct exposure | Securities Investment          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk     35,374   41,000
PR Government direct exposure | PR government and its instrumentalities and municipalities [Member]          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk     370,000   432,000
PR Government Indirect Exposure          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk     321,000   350,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA     264,000   276,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk     46,000   46,000
PR Government Indirect Exposure | Commercial real estate          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk     11,000   21,000
PR Government Indirect Exposure | Pass Through securities that have been economically defeased and refunded          
Commitments and Contingencies Disclosure          
Outstanding concentration of risk       $ 7,000 $ 7,000
USVI Government Direct Exposure | From USVI Government And Public Corporations          
Commitments and Contingencies Disclosure          
Total concentration of risk     76,000    
With BVI government | BVI          
Commitments and Contingencies Disclosure          
Loans held-in-portfolio     $ 19,000