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Noninterest Income and Noninterest Expense - Net periodic benefit cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Plan        
Components of net periodic benefit cost        
Interest cost $ 1,886 $ 1,950 $ 5,645 $ 5,761
Expected return on plan assets (876) (878) (2,628) (2,634)
Recognized net actuarial loss (gain) 382 503 1,148 1,509
Total net periodic benefit cost 1,392 1,575 4,165 4,636
Other Postretirement Benefits Plan        
Components of net periodic benefit cost        
Interest cost 203 182 653 604
Recognized net actuarial loss (gain) (300) (322) (902) (966)
Total net periodic benefit cost 65 15 251 67
Other Postretirement Benefits Plan | Salaries and employee benefits        
Components of net periodic benefit cost        
Service cost $ 162 $ 155 $ 500 $ 429