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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 1,049 $ 730  
Defined Benefit Plan, Benefit Obligation 8,065 7,515 $ 7,186
Defined Benefit Plan, Net Periodic Benefit Cost (100) (12)  
Defined Benefit Plan, Benefits Paid 532 553  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 468    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 428    
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 437    
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 453    
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 468    
Defined Benefit Plan, Expected Future Benefit Payment 2,063    
Change in Projected Benefit Obligation from Change in Projected Discount Rate 786    
Defined Benefit Plan, Accumulated Benefit Obligation $ 8,065 $ 7,515  
Defined Benefit Plan, Target Plan Asset Allocations 100.00% 100.00%  
Accumulated Postretirement Benefit Obligation $ 1,477 $ 1,392  
Supplemental Employee Retirement Plan, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 3,529 3,428  
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 495 491  
Cash Surrender Value of Life Insurance 39,608 38,763  
Defined Benefit Plan, Net Periodic Benefit Cost 86 101  
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 24 29  
Defined Benefit Plan, Contributions by Employer $ 24 $ 29  
Defined Benefit Plan, Percentage of Plan Funded 94.20% 95.00%  
Domestic equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 31.60% 31.70%  
Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 62.60% 57.70%  
Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 5.80% 10.60%  
JPMCB LDI Diversified Balanced Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Investment concentration 99.00% 98.00%  
Maximum [Member] | Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Contribution Percentage 5.00%    
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 $ 82 $ 166  
Pension and Other Postretirement Benefits Cost (Reversal of Cost) $ 2 $ 3  
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