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Nature of Operations (Narrative) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 16, 2019
USD ($)
$ / shares
shares
Dec. 31, 2020
item
shares
Dec. 31, 2019
USD ($)
shares
Nature Of Operations [Line Items]      
Gross proceeds     $ 91,578
Common stock, shares sold (in shares) | shares 19,484,343 19,047,544 19,473,818
Exchange ratio 2.0212    
Common stock, shares outstanding | shares 19,484,343 19,047,544 19,473,818
Number of banking offices | item   7  
Second-Step Stock Offering [Member]      
Nature Of Operations [Line Items]      
Gross proceeds $ 102,100    
Common stock, shares sold (in shares) | shares 10,212,397    
Common stock, share issue price per share (in dollars per share) | $ / shares $ 10.00    
Proceeds used to fund ESOP $ 8,200    
Purchase by ESOP (in shares) | shares 816,992    
Purchase by ESOP (in dollars per share) | $ / shares $ 10.00    
Share issue, related expenses $ 2,400    
Net proceeds invested in Bank's operations $ 45,800    
Exchange ratio 2.0212    
Mutual Holding Company MHC [Member]      
Nature Of Operations [Line Items]      
Percentage of ownership (as a percent) 52.00%