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Income taxes - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Income Taxes          
Deferred Tax Assets Net $ 948,964   $ 948,964   $ 1,049,895
Deferred Tax Assets Valuation Allowance 491,835   491,835   496,307
Deferred Tax Liabilities 127,320   127,320   96,406
Unrecognized Tax Benefits Interest On Income Taxes Accrued 3,000   3,000   2,800
Unrecognized Tax Benefits That Would Impact Effective Tax Rate 10,100   10,100   $ 9,000
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit 3,200   3,200    
Recognized Tax Benefits Current Interest On Income Taxes Accrued     287 $ 328  
Income Tax Expense Benefit 40,330 $ (28,560) $ 90,553 (6,405)  
Computed income tax at statutory rates     37.50%   39.00%
Closing Agreement with the Puerto Rico Department of Treasury          
Income Taxes          
Income Tax Expense Benefit   108,900      
FDIC Termination Agreement          
Income Taxes          
Income Tax Expense Benefit   45,000      
"Deemed sale" incremental tax liability at the capital gains rate | Closing Agreement with the Puerto Rico Department of Treasury          
Income Taxes          
Income Tax Expense Benefit   49,800      
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 Benefit   158,700      
Other assets          
Income Taxes          
Deferred Tax Assets Net 900,000   $ 900,000   $ 1,000,000
Other liabilities          
Income Taxes          
Deferred Tax Liabilities 953   953   926
PUERTO RICO          
Income Taxes          
Deferred Tax Assets Net 629,000   629,000    
Deferred Tax Assets Valuation Allowance 96,596   96,596   89,852
Deferred Tax Liabilities 85,803   85,803   68,483
Income Tax Expense Benefit $ 40,330 $ (28,560) $ 90,553 $ (6,405)  
Computed income tax at statutory rates 38.00% 39.00% 38.00% 39.00%  
UNITED STATES          
Income Taxes          
Deferred Tax Assets Net $ 319,000   $ 319,000    
Deferred Tax Assets Valuation Allowance 395,239   395,239   406,455
Deferred Tax Assets 714,000   714,000    
Deferred Tax Liabilities $ 41,517   $ 41,517   $ 27,923