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v3.26.1

Summary of significant accounting policies - Nature of operations and Basis of presentation (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2026 $ / shares | Jun. 30, 2026 $ / shares | Mar. 31, 2026 $ / shares | Jun. 30, 2025 $ / shares | Mar. 31, 2025 $ / shares | Jun. 30, 2026 Office $ / shares | Jun. 30, 2025 $ / shares
Summary of significant accounting policies |  |  |  |  |  |  |
Number of full-service community banking offices | Office |  |  |  |  |  | 40 |
Cash dividends declared (in dollars per share) |  | $ 0.625 | $ 0.625 | $ 0.6175 | $ 0.6175 | $ 1.25 | $ 1.235
2026 Q3 dividend | Subsequent events |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Dividend declared date | Jul. 31, 2026 |  |  |  |  |  |
Cash dividends declared (in dollars per share) | $ 0.625 |  |  |  |  |  |
Dividend payable date | Sep. 15, 2026 |  |  |  |  |  |
Dividend record date | Aug. 31, 2026 |  |  |  |  |  |

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