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Income taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Valuation allowance $ 520,096,000 $ 499,975,000  
Net deferred tax assets (net of valuation allowance) 851,592,000 886,353,000  
Net deferred tax asset 850,695,000 884,985,000  
Unrecognized Tax Benefits Interest On Income Taxes Accrued 4,800,000 3,500,000  
Unrecognized Tax Benefits That Would Impact Effective Tax Rate 10,200,000 10,500,000  
Recognized Tax Benefits Current Interest On Income Taxes Accrued 2,000,000.0 664,000  
Unrecognized Tax Benefits Expected Decreases Resulting From Settlements With Taxing Authorities 13,600,000    
Income tax expense 111,938,000 147,181,000 $ 119,579,000
Interest Expense Reduction Due To Expiration Of The Statue Of Limitations 645,000 26,000,000  
Deferred tax asset unrecognized tax benefit 8,700,000    
Closing Agreement with the Puerto Rico Department of Treasury      
Income Taxes      
Income tax expense     108,900,000
FDIC Termination Agreement      
Income Taxes      
Income tax expense     45,000,000.0
"Deemed sale" incremental tax liability at the capital gains rate | Closing Agreement with the Puerto Rico Department of Treasury      
Income Taxes      
Income tax expense     49,800,000
Increase in the deferred tax asset due to increase in the tax basis of the loans | Closing Agreement with the Puerto Rico Department of Treasury      
Income Taxes      
Income tax expense     $ 158,700,000
Qualified Plan      
Income Taxes      
Deferred Tax Assets, Other Loss Carryforwards 29,000,000    
Other liabilities      
Income Taxes      
Net deferred tax liabilities 897,000 1,400,000  
PUERTO RICO      
Income Taxes      
Valuation allowance 112,871,000 100,175,000  
Net deferred tax asset $ 549,290,000 $ 577,836,000  
Corporate tax rate 38.00% 37.50% 39.00%
Dividends Received Deduction From Controlled Subsidiary Percentage 100.00%    
Dividends Received Deductions From Other Taxable Domestic Corporations Percentage 85.00%    
Income tax expense $ 111,938,000 $ 147,181,000 $ 119,579,000
Income tax expense recognized attributable to Law Act No. 257     $ 27,700,000
UNITED STATES      
Income Taxes      
Valuation allowance 407,225,000 399,800,000  
Deferred Tax Assets 708,000,000    
Net deferred tax asset $ 301,405,000 $ 307,149,000