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Benefit Plans - Components of net periodic benefit cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Components of net periodic benefit cost      
Interest cost $ 3,309 $ 3,643 $ 2,466
Expected return on plan assets (3,513) (3,534) (3,124)
Recognized net actuarial loss (gain) 1,924 2,818 1,906
Total net periodic benefit cost $ 1,720 $ 2,927 $ 1,248
Defined Benefit Plan, Funding Status [Extensible Enumeration] Defined Benefit Plan, Funded Plan [Member] Defined Benefit Plan, Funded Plan [Member] Defined Benefit Plan, Funded Plan [Member]
Pension Plan [Member]      
Components of net periodic benefit cost      
Interest cost $ 7,603 $ 8,275 $ 5,518
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Expected return on plan assets $ (3,513) $ (3,534) $ (3,124)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Recognized net actuarial loss (gain) $ 2,209 $ 2,818 $ 5,643
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Total net periodic benefit cost $ 6,299 $ 7,559 $ 8,037
Other Postretirement Benefits Plan [Member]      
Components of net periodic benefit cost      
Service cost 618 545  
Interest cost $ 824 $ 844 $ 565
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Recognized net actuarial loss (gain) $ (1,383) $ (1,676) $ (497)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Total net periodic benefit cost $ 59 $ (287) $ 857
Other Postretirement Benefits Plan [Member] | Salaries and employee benefits      
Components of net periodic benefit cost      
Service cost $ 618 $ 545 $ 789