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Income taxes - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Income Taxes [Line Items]            
Valuation allowance $ 463,718,000     $ 463,718,000   $ 456,751,000
Net deferred tax assets (net of valuation allowance) 862,089,000     862,089,000   926,329,000
Net deferred tax asset 860,333,000     860,333,000   924,756,000
Unrecognized tax benefits, accrued interest 2,500,000     2,500,000   2,400,000
Accrual for the payment of penalties 0     0   0
Total amount of unrecognized tax benefits, that if recognized, would affect effective tax rate 3,000,000.0     3,000,000.0   3,000,000.0
Income tax expense 47,884,000 $ 40,459,000   92,947,000 $ 96,027,000  
Dividends paid       98,661,000 90,151,000  
Out-of-period adjustment            
Income Taxes [Line Items]            
Income tax credits and adjustments     $ 16,500,000      
Other assets            
Income Taxes [Line Items]            
Net deferred tax assets (net of valuation allowance) 862,100,000     862,100,000   926,300,000
Other liabilities            
Income Taxes [Line Items]            
Net deferred tax liabilities 1,800,000     1,800,000   1,600,000
PR            
Income Taxes [Line Items]            
Valuation allowance 76,804,000     76,804,000   69,837,000
Net deferred tax asset 618,084,000     618,084,000   671,394,000
Income tax expense 47,884,000 40,459,000   92,947,000 96,027,000  
Deferred tax asset valuation allowance 4,050,000 $ (235,000)   7,932,000 $ 2,328,000  
US            
Income Taxes [Line Items]            
Valuation allowance 386,914,000     386,914,000   386,914,000
Net deferred tax asset 242,249,000     242,249,000   $ 253,362,000
Deferred Tax Assets $ 629,100,000     $ 629,100,000