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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 15.00%    
Defined Contribution Plan, Employer Contributions, Vesting Period 5 years    
Defined Contribution Plan, Cost $ 730 $ 738  
Defined Benefit Plan, Benefit Obligation 7,515 7,186 $ 8,465
Defined Benefit Plan, Net Periodic Benefit Cost (12) (98)  
Defined Benefit Plan, Benefits Paid 553 582  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 477    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 466    
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 4,670    
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 453    
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 438    
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 2,115    
Change in Projected Benefit Obligation from Change in Projected Discount Rate 801    
Defined Benefit Plan, Accumulated Benefit Obligation $ 7,515 $ 7,186  
Defined Benefit Plan, Target Plan Asset Allocations 100.00% 100.00%  
Accumulated Postretirement Benefit Obligation $ 1,392 $ 1,291  
Multiemployer Plans, Postretirement Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 29 46  
Defined Benefit Plan, Contributions by Employer $ 29 $ 46  
Defined Benefit Plan, Percentage of Plan Funded 95.00% 91.40%  
Defined Benefit Plan, Contribution Percentage 5.00%    
Supplemental Employee Retirement Plan, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 3,428 $ 3,362  
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 491 434  
Cash Surrender Value of Life Insurance 38,763 37,932  
Defined Benefit Plan, Net Periodic Benefit Cost $ 101 $ 149  
Cash And Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 0.00% 4.20%  
Domestic equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 31.70% 46.10%  
Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 57.70% 45.80%  
Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 10.60% 3.90%  
Commingled Pensions Trust Fund [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 10.00%    
Commingled Pensions Trust Fund [Member] | Minimum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 35.00%    
Commingled Pensions Trust Fund [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 65.00%    
Commingled Pensions Trust Fund [Member] | Maximum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 90.00%    
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 166 $ 249  
Pension and Other Postretirement Benefits Cost (Reversal of Cost) $ 3 $ 6  
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Payment Period 5 years    
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Payment Period 15 years