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Goodwill and other intangible assets - Additional Information (Details) - USD ($)
3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jul. 31, 2019
Goodwill and other intangible assets                
Amortization Of Intangible Assets $ 1,076,000 $ 2,399,000   $ 5,345,000 $ 7,082,000      
Finite-Lived Core Deposits, Gross           $ 24,400,000    
Finite-Lived Customer Relationships, Gross           $ 16,300,000    
Identifiable intangible assets $ 6,100,000     6,100,000     $ 6,100,000  
Changes in the carrying amount of goodwill       $ 0 $ 0      
Discounted cash flow approach | Minimum                
Goodwill and other intangible assets                
Cost of equity discount rate 10.72%     10.72%        
Discounted cash flow approach | Maximum                
Goodwill and other intangible assets                
Cost of equity discount rate 15.13%     15.13%        
Banco Popular de Puerto Rico                
Goodwill and other intangible assets                
Step 1 Fair Value Excess Over Carrying Amount     $ 282,000,000         $ 1,200,000,000
Percentage excess of fair value of reporting unit over equity value     9.00%         37.00%
Popular U.S.                
Goodwill and other intangible assets                
Step 1 Fair Value Excess Over Carrying Amount     $ 215,000,000         $ 338,000,000
Percentage excess of fair value of reporting unit over equity value     13.00%         21.00%
Goodwill impairment charge     $ 0          
Banco Popular de Puerto Rico and Popular Bank                
Goodwill and other intangible assets                
Percentage Of Goodwill     91.00%