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Goodwill and other intangible assets - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 31, 2019
Aug. 01, 2018
Goodwill and other intangible assets          
Amortization Of Intangible Assets $ 9,370,000 $ 9,326,000 $ 9,378,000    
Goodwill on acquisition   60,242,000      
Changes in the carrying amount of goodwill $ 0 0      
Minimum          
Goodwill and other intangible assets          
Cost of equity discount rate 11.14%        
Maximum          
Goodwill and other intangible assets          
Cost of equity discount rate 12.58%        
Reliable Financial Services          
Goodwill and other intangible assets          
Identifiable intangible assets         $ 488,000
Goodwill on acquisition   43,800,000      
Banco Popular de Puerto Rico          
Goodwill and other intangible assets          
Step 1 Fair Value Excess Over Carrying Amount       $ 1,200,000,000  
Percentage excess of fair value of reporting unit over equity value       37.00%  
Goodwill on acquisition   60,242,000      
Popular U.S.          
Goodwill and other intangible assets          
Step 1 Fair Value Excess Over Carrying Amount       $ 338,000,000  
Percentage excess of fair value of reporting unit over equity value       21.00%  
Goodwill on acquisition   0      
Banco Popular de Puerto Rico and Popular Bank          
Goodwill and other intangible assets          
Percentage Of Goodwill       91.00%  
Trademarks | Reliable Financial Services          
Goodwill and other intangible assets          
Identifiable intangible assets   500,000      
Trademarks | E-Loan          
Goodwill and other intangible assets          
Identifiable intangible assets $ 6,100,000 6,100,000      
Customer relationship          
Goodwill and other intangible assets          
Finite-Lived Customer Relationships, Gross 42,909,000 $ 34,915,000      
Identifiable intangible assets $ 9,600,000