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Acquisition (Narrative) (Details)
$ in Thousands
12 Months Ended
May 01, 2020
USD ($)
shares
Apr. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Goodwill, Acquisition       $ 0
FSB Bancorp, Inc [Member]        
Business Acquisition [Line Items]        
Net loans receivable $ 272,100      
Number of banking offices | item     5  
Paid in cash $ 17,100      
Fair value of shares issued   $ 11,700    
Merger-related expenses     $ 6,000 $ 200
FSB Bancorp, Inc [Member] | Buildings [Member]        
Business Acquisition [Line Items]        
Estimated useful life     39 years  
FSB Bancorp, Inc [Member] | Improvements And Equipment [Member]        
Business Acquisition [Line Items]        
Estimated useful life     10 years  
FSB Bancorp, Inc [Member] | Core Deposit Intangibles [Member]        
Business Acquisition [Line Items]        
Estimated useful life     10 years  
FSB Bancorp, Inc [Member] | Evans Common Stock [Member]        
Business Acquisition [Line Items]        
Shares of common stock | shares 422,475      
As Recorded By FSB [Member] | FSB Bancorp, Inc [Member]        
Business Acquisition [Line Items]        
Total assets $ 321,712      
Net loans receivable 273,869      
Securities 21,371      
Total liabilities 293,059      
Deposits 237,688      
Borrowings 50,597      
As Recorded At Acquisition [Member]        
Business Acquisition [Line Items]        
Total assets 323,164      
Net loans receivable 271,385      
Securities 21,477      
Total liabilities 296,076      
Deposits 239,173      
Borrowings 52,526      
As Recorded At Acquisition [Member] | FSB Bancorp, Inc [Member]        
Business Acquisition [Line Items]        
Goodwill, Acquisition 1,800      
As Recorded At Acquisition [Member] | FSB Bancorp, Inc [Member] | Core Deposit Intangibles [Member]        
Business Acquisition [Line Items]        
Intangible Assets, Acquisition $ 200