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Mergers and acquisitions - Consideration for FNB Financial Corp. (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 14, 2020
Dec. 31, 2020
Dec. 31, 2019
Business Combination, Consideration Transferred [Abstract]      
Goodwill resulting from merger     $ 31,961
FNB Financial Corp.      
Business Combination, Consideration Transferred [Abstract]      
Net shares issued (in shares) 954,797    
Purchase price per share (dollar per share) $ 36.70    
Value of stock consideration $ 35,041    
Cash consideration paid 15,001    
Total purchase price 50,042    
Preliminary fair value of net assets acquired 43,723    
Goodwill resulting from merger $ 6,319 $ 6,319