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Acquisition (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
May 01, 2020
USD ($)
item
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Assets   $ 1,062,495     $ 1,009,927
Total deposits   919,661     $ 835,737
Merger-related expenses   $ 273 $ 19    
Forecast [Member]          
Business Acquisition [Line Items]          
Estimated non-recurring costs to facilitate merger and integrate       $ 1,800  
Subsequent Event [Member]          
Business Acquisition [Line Items]          
Number of businesses combined in acquisition | item 2        
Assets $ 1,600,000        
Total deposits 1,400,000        
Loans $ 1,100,000        
Subsequent Event [Member] | MNB Corporation [Member]          
Business Acquisition [Line Items]          
Conversion | $ / shares $ 43.767        
Shares issued | shares 1,176,993        
Number of branches operated by acquiree | item 9        
Number of shares issuable per share of acquiree common stock | shares 1.039