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Postretirement Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2008
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Other Other
Postretirement Life Insurance      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, minimum service period requirement 10 years 20 years  
Life insurance coverage amount until age 65   $ 50  
Decrease in coverage amount after age 65   5  
Life insurance coverage amount   $ 5  
Defined Benefit Postretirement Health and Life Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, minimum service period requirement 10 years 20 years  
Defined benefit plan, coverage period   5 years  
Percentage increase in postretirement benefit health insurance reimbursable premium   36.79%  
Defined Benefit Postretirement Health and Life Benefit Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Postretirement benefit health insurance reimbursable premium   $ 5  
Post-Retirement Health Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, minimum service period requirement   20 years  
Defined benefit plan, coverage period   5 years  
Post-Retirement Health Benefit Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Postretirement benefit health insurance reimbursable premium   $ 5  
Defined Benefit Postretirement Health And Life Coverage      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation   297 $ 399
Director's Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation   1,300 1,200
Cash surrender value of bank owned life insurance   4,100 4,100
Scottdale Defined Benefit Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation   3,800 4,800
Scottdale Defined Benefit Pension Plan | Scottdale Bank and Trust Company      
Defined Benefit Plan Disclosure [Line Items]      
Settlement gains recognized   $ 0 47
Scottdale Defined Benefit Pension Plan | Maximum | Scottdale Bank and Trust Company | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation   20.00%  
Scottdale Defined Benefit Pension Plan | Maximum | Scottdale Bank and Trust Company | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation   50.00%  
Scottdale Defined Benefit Pension Plan | Maximum | Scottdale Bank and Trust Company | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation   60.00%  
Scottdale Defined Benefit Pension Plan | Minimum | Scottdale Bank and Trust Company | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation   30.00%  
Scottdale Defined Benefit Pension Plan | Minimum | Scottdale Bank and Trust Company | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation   40.00%  
Riverview Defined Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation   $ 6,400 $ 8,200