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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Commitments and Contingencies Disclosure        
Loans And Leases Receivable Gross Carrying Amount $ 35,420,879 $ 35,420,879 $ 32,372,925  
Increase to the FDIC loss estimate   $ 4,100,000    
Increase in percentage to the FDIC's loss estimate 25.00% 25.00%    
FDIC Indemnification Asset $ 20,400,000 $ 20,400,000    
FDIC deposit insurance expense   105,985 26,787 $ 25,579
Popular U.S.        
Commitments and Contingencies Disclosure        
Estimated uninsured deposit     3,500,000  
BPPR        
Commitments and Contingencies Disclosure        
Estimated uninsured deposit     28,100,000  
BPPR | Fully collateralized public sector        
Commitments and Contingencies Disclosure        
Estimated uninsured deposit     16,200,000  
FDIC Special Assessment        
Commitments and Contingencies Disclosure        
FDIC deposit insurance expense 71,400      
FDIC deposit insurance expense net of tax 45,300      
Incremental expense for FDIC special assessment   18,000    
Estimated uninsured deposits excluded from FDIC special assessment $ 5,000,000 $ 5,000,000    
FDIC special assessments annual rate 0.134% 0.134%    
FDIC special assessment quarterly rate 0.0335% 0.0335%    
Commitments to extend credit        
Commitments and Contingencies Disclosure        
Reserve of potential losses associated with unfunded loan commitments $ 17,000 $ 17,000 8,800  
Noncredit commitment        
Commitments and Contingencies Disclosure        
Investments 3,300 3,300 4,800  
Residential mortgage loans        
Commitments and Contingencies Disclosure        
Loans And Leases Receivable Gross Carrying Amount 1,900,000 1,900,000 1,600,000  
SBA loans under PPP program        
Commitments and Contingencies Disclosure        
Loans And Leases Receivable Gross Carrying Amount 9,200 9,200 38,000  
BVI | Retail and commerical loans        
Commitments and Contingencies Disclosure        
Loans And Leases Receivable Gross Carrying Amount 205,000 205,000 214,000  
Insured or guaranteed by the U.S. Government or its agencies | Commercial Loans        
Commitments and Contingencies Disclosure        
Loans And Leases Receivable Gross Carrying Amount 80,000 80,000 72,000  
PR Government direct exposure        
Commitments and Contingencies Disclosure        
Total concentration of risk   361,604 374,000  
Outstanding concentration of risk $ 332,604 $ 332,604 327,000  
Exposure Municipal Loans And Securities 76.00% 76.00%    
PR Government direct exposure | Loans        
Commitments and Contingencies Disclosure        
Outstanding concentration of risk $ 313,729 $ 313,729 302,000  
PR Government direct exposure | Securities Investment        
Commitments and Contingencies Disclosure        
Outstanding concentration of risk 18,875 18,875 25,000  
PR Government Indirect Exposure        
Commitments and Contingencies Disclosure        
Outstanding concentration of risk 238,000 238,000 251,000  
Loans and Leases Receivable, Consumer, Mortgage with PRHA 191,000 191,000 209,000  
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans        
Commitments and Contingencies Disclosure        
Outstanding concentration of risk $ 40,000 40,000 42,000  
USVI Government Direct Exposure | From USVI Government And Public Corporations        
Commitments and Contingencies Disclosure        
Total concentration of risk   $ 28,000 $ 28,000