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Postretirement Benefit Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Settlement gains recognized $ 34,000 $ 737,000  
Postretirement Life Insurance [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, minimum service period requirement 20 years   10 years
Defined benefit plan, minimum retirement age 55 years    
Defined benefit plan, benefit description, until age 65 The insurance amount will be $50,000 until age 65.    
Life insurance coverage amount until age 65 $ 50,000    
Defined benefit plan, benefit description, after age 65 After age 65, the insurance amount will decrease by $5,000 per year until age 74.    
Decrease in coverage amount after age 65 $ 5,000    
Life insurance coverage amount $ 5,000    
Defined Benefit Postretirement Health and Life Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, minimum service period requirement 20 years    
Defined benefit plan, minimum retirement age 55 years    
Percentage increase in postretirement benefit health insurance reimbursable premium 36.79%    
Defined benefit plan, coverage period 5 years    
Defined Benefit Postretirement Health and Life Benefit Plan [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Postretirement benefit health insurance reimbursable premium $ 5,000    
Post-Retirement Health Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, minimum service period requirement 20 years    
Defined benefit plan, coverage period 5 years    
Defined benefit plan, minimum retirement age Employees who had achieved ten years of service as of January 1, 2008 and subsequently retire after at least 20 years of service are eligible for reimbursement of major medical insurance premiums up to $5,000, if the employee has not yet reached age 65.    
Post-Retirement Health Benefit Plan [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Postretirement benefit health insurance reimbursable premium $ 5,000    
Defined Benefit Postretirement Health And Life Coverage [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation 404,000 475,000  
Defined benefit plan, amount to be amortized from accumulated other comprehensive income (loss) next fiscal year 25,000    
Director's Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation 1,077,000 1,100,000  
Defined benefit plan, amount to be amortized from accumulated other comprehensive income (loss) next fiscal year 0    
Unrecognized prior service cost credit generated by adoption of plan     $ 274,000
Recognized prior service cost credit and fully amortized   22,000  
Cash surrender value of bank owned life insurance 3,921,000 3,976,000  
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation 5,587,000 5,163,000  
Settlement gains recognized (91,000) 118,000  
Defined Benefit Pension Plan [Member] | Scottdale Bank and Trust Company [Member] | Other Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Settlement gains recognized $ 34,000 $ 737,000  
Defined Benefit Pension Plan [Member] | Maximum [Member] | Scottdale Bank and Trust Company [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation 20.00%    
Defined Benefit Pension Plan [Member] | Maximum [Member] | Scottdale Bank and Trust Company [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation 50.00%    
Defined Benefit Pension Plan [Member] | Maximum [Member] | Scottdale Bank and Trust Company [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation 60.00%    
Defined Benefit Pension Plan [Member] | Minimum [Member] | Scottdale Bank and Trust Company [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation 30.00%    
Defined Benefit Pension Plan [Member] | Minimum [Member] | Scottdale Bank and Trust Company [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of target portfolio allocation 40.00%