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Summary of significant accounting policies - Nature of operations and Basis of presentation (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Oct. 25, 2024 $ / shares | Sep. 30, 2024 $ / shares | Jun. 30, 2024 $ / shares | Mar. 31, 2024 $ / shares | Sep. 30, 2023 $ / shares | Jun. 30, 2023 $ / shares | Mar. 31, 2023 $ / shares | Sep. 30, 2024 Office $ / shares | Sep. 30, 2023 $ / shares
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Number of full-service community banking offices | Office |  |  |  |  |  |  |  | 39 |
Dividends declared |  | $ 0.62 | $ 0.41 | $ 0.41 | $ 0.41 | $ 0.41 | $ 0.41 | $ 1.44 | $ 1.23
Dividend declared |  | 50.60% |  |  |  |  |  |  |
Subsequent events | Fourth quarter dividend |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Dividend declared date | Oct. 25, 2024 |  |  |  |  |  |  |  |
Dividends declared | $ 0.6175 |  |  |  |  |  |  |  |
Dividend payable date | Dec. 13, 2024 |  |  |  |  |  |  |  |
Dividend record date | Nov. 29, 2024 |  |  |  |  |  |  |  |

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