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Stock-based compensation - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Restricted Stock Units (RSUs)          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Stock-Based Compensation, vesting rights     Unless otherwise stated in an agreement, the compensation cost associated with the shares of restricted stock granted prior to 2021 was determined based on a two-prong vesting schedule. These grants include ratable vesting over five or four years commencing at the date of grant (“the graduated vesting portion”) with a portion vested at termination of employment after attainment of 55 years of age and 10 years of service or 60 years of age and 5 years of service (“the retirement vesting portion”). The graduated vesting portion is accelerated at termination of employment after attaining the earlier of 55 years of age and 10 years of service or 60 years of age and 5 years of service. Restricted stock granted on or after 2021 have ratable vesting in equal annual installments over a period of 4 years or 3 years, depending on the classification of the employee. The vesting schedule is accelerated at termination of employment after attaining the earlier of 55 years of age and 10 years of service or 60 years of age and 5 years of service.    
Performance Based Shares | Minimum          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Vested and expected to vest range based on shareholder return 50.00%   50.00%    
Performance Based Shares | Maximum          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Vested and expected to vest range based on shareholder return 150.00%   150.00%    
Executive Officers          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Total unrecognized compensation cost related to non-vested restricted stock awards and performance shares to members of management $ 14,600   $ 14,600    
Total unrecognized compensation cost related to non-vested restricted stock awards and performance shares to members of management, period of recognition (in years)     1 year 6 months 29 days    
Fair value of stocks vested at grant date     $ 20,000    
Fair Market Value of stock vested     27,400    
Windfall Net Of Shortfall     $ 2,700    
Executive Officers | Performance Based Shares          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Stock granted 0 0 31,660 65,225  
Restricted Stock Expense (Benefit) $ (1,000) $ (500) $ 3,200 $ 3,500  
Incentive award, tax benefit (expense) $ (100) $ (32) $ 300 $ 200  
Stock-Based Compensation, vesting rights     The number of shares that will ultimately vest ranges from 50% to a 150% target based on both market (TSR) and performance (ROATCE) conditions. The performance shares will vest at the end of the three-year performance cycle. If a participant terminates employment after attaining the earlier of 55 years of age and 10 years of service or 60 years of age and 5 years of service, the performance shares shall continue outstanding and vest at the end of the performance cycle.    
Executive Officers | Restricted stock          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Stock granted 0 928 194,268 176,519  
Restricted Stock Expense (Benefit) $ 2,100 $ 1,800 $ 16,400 $ 12,300  
Incentive award, tax benefit (expense) 400 400 $ 2,100 2,000  
Directors          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Stock granted     23,310   25,462
Restricted Stock Expense (Benefit) 600 100 $ 1,300 2,200  
Incentive award, tax benefit (expense) $ 100 $ 21 $ 200 $ 400  
Directors | Restricted Stock Units (RSUs)          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Stock granted 1,260 1,281 20,622 22,887  
Fair Market Value of stock vested     $ 2,300    
Directors | Unrestricted Stock          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Stock granted       1,392  
Directors | Restricted stock          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Stock granted 0 0 2,688