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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