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Mergers and acquisitions - Schedule of Consideration (Details) - FNB Financial Corp. - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	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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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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