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Summary of significant accounting policies - Nature of operations and Basis of presentation (Details) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 25, 2025 $ / shares | Jun. 30, 2025 $ / shares | Mar. 31, 2025 $ / shares | Jun. 30, 2024 $ / shares | Mar. 31, 2024 $ / shares | Jun. 30, 2025 Office $ / shares | Jun. 30, 2024 $ / shares
Summary of significant accounting policies |  |  |  |  |  |  |
Number of full-service community banking offices | Office |  |  |  |  |  | 39 |
Dividends declared |  | $ 0.6175 | $ 0.6175 | $ 0.41 | $ 0.41 | $ 1.24 | $ 0.82
Second quarter dividend | Subsequent events |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Dividend declared date | Jul. 25, 2025 |  |  |  |  |  |
Dividends declared | $ 0.6175 |  |  |  |  |  |
Dividend payable date | Sep. 15, 2025 |  |  |  |  |  |
Dividend record date | Aug. 29, 2025 |  |  |  |  |  |

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