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Summary of significant accounting policies - Nature of operations and Basis of presentation (Details) |  | 3 Months Ended | 9 Months Ended
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Oct. 28, 2022 $ / shares | Sep. 30, 2022 $ / shares | Jun. 30, 2022 $ / shares | Mar. 31, 2022 $ / shares | Sep. 30, 2021 $ / shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Sep. 30, 2022 Office $ / shares | Sep. 30, 2021 $ / shares
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Number of full-service community banking offices | Office |  |  |  |  |  |  |  | 28 |
Dividends declared | $ / shares | $ 0.40 | $ 0.40 | $ 0.39 | $ 0.39 | $ 0.38 | $ 0.37 | $ 0.37 | $ 1.18 | $ 1.12

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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