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Retirement Plans, Pension and Postretirement Plans Table (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in Benefit Obligation |  |  |
Fair Value Of Plan Assets As A Percentage Of Net Benefit Obligation | 224.00% | 215.00% |
RAP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Description | The Corporation has a noncontributory defined benefit RAP, covering substantially all employees who meet participation requirements. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes. |  |
Change in Fair Value of Plan Assets |  |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | $ 453,457 | $ 407,405 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 43,676 | 60,565 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 0 | 0 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (18,163) | (14,513) |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 478,970 | 453,457 | $ 407,405
Change in Benefit Obligation |  |  |
Defined Benefit Plan, Benefit Obligation, Beginning Balance | 211,353 | 208,315 |
Defined Benefit Plan, Service Cost | 3,027 | 3,189 | 3,670
Defined Benefit Plan, Interest Cost | 11,173 | 10,887 | 7,152
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 5,975 | 3,475 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (18,163) | (14,513) |
Defined Benefit Plan, Benefit Obligation, Ending Balance | 213,365 | 211,353 | 208,315
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 265,605 | 242,104 |
Assets for Plan Benefits, Defined Benefit Plan | 265,605 | 242,104 |
Liability, Defined Benefit Plan, Current | 0 | 0 |
Liability, Defined Benefit Plan, Noncurrent | 0 | 0 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total | $ 265,605 | 242,104 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Description | The Corporation also provides legacy healthcare access to a limited group of retired employees from a previous acquisition in the Postretirement Plan. There are no other active retiree healthcare plans. |  |
Change in Fair Value of Plan Assets |  |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | $ 0 | 0 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 183 | 171 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (183) | (171) |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 0 | 0 | 0
Change in Benefit Obligation |  |  |
Defined Benefit Plan, Benefit Obligation, Beginning Balance | 1,425 | 1,530 |
Defined Benefit Plan, Service Cost | 0 | 0 |
Defined Benefit Plan, Interest Cost | 73 | 78 | 53
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 729 | (12) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (183) | (171) |
Defined Benefit Plan, Benefit Obligation, Ending Balance | 2,043 | 1,425 | $ 1,530
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (2,043) | (1,425) |
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0 |
Liability, Defined Benefit Plan, Current | (212) | (158) |
Liability, Defined Benefit Plan, Noncurrent | (1,832) | (1,267) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total | $ (2,043) | $ (1,425) |

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