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Borrowings - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maximum Amount Available $ 3,000,000,000.0 $ 3,000,000,000.0
Federal Home Loan Bank Advances And Letters Of Credit Amount Used 500,000,000 500,000,000
Assets sold under agreements to repurchase 86,470,000 121,303,000
Other short-term borrowings $ 0 0
Popular Capital Trust I | Trust preferred securities redemption | 6.70% Cumulative Monthly Income Trust Preferred Securities    
Debt Disclosure    
Trust preferred securities stated interest rate 6.70%  
Trust preferred securities redemption date Nov. 01, 2021  
Capital securities $ 181,063,250  
Common securities 5,600,550  
Cumulative monthly income trust preferred securities outstanding $ 186,663,800  
Trust Preferred Securities Redemption Price Per Share $ 25  
Accrued and unpaid distrubtion per share 0.139583  
Trust Preferred Securities Liquidation Price Per Share 25  
Dividends perferred stock per share $ 25.139583  
Advances with FRB    
Debt Disclosure    
Line Of Credit Facility Current Borrowing Capacity $ 1,300,000,000 1,400,000,000
Federal Home Loan Bank    
Debt Disclosure    
Line Of Credit Facility Capacity Available For Specific Purpose Other Than For Trade Purchases $ 1,200,000,000 $ 900,000,000