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Income taxes - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Income Taxes [Line Items]            
Valuation allowance $ 465,048,000     $ 465,048,000   $ 456,751,000
Net deferred tax assets (net of valuation allowance) 837,375,000     837,375,000   926,329,000
Net deferred tax asset 835,543,000     835,543,000   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 35,971,000 $ 42,463,000   128,918,000 $ 138,490,000  
Dividends paid       146,840,000 135,495,000  
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) 837,300,000     837,300,000   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 78,134,000     78,134,000   69,837,000
Net deferred tax asset 597,057,000     597,057,000   671,394,000
Income tax expense 35,970,000 42,463,000   128,918,000 138,490,000  
Deferred tax asset valuation allowance 2,748,000 $ 451,000   10,680,000 $ 2,779,000  
US            
Income Taxes [Line Items]            
Valuation allowance 386,914,000     386,914,000   386,914,000
Net deferred tax asset 238,486,000     238,486,000   $ 253,362,000
Deferred Tax Assets $ 625,400,000     $ 625,400,000