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Mergers and acquisitions - Schedule of Consideration (Details) - FNB Financial Corp. - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended
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Feb. 14, 2020 | Sep. 30, 2020
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 | 43,652 |
Preliminary goodwill resulting from merger | $ 6,390 | $ 6,390

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