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Summary of significant accounting policies - Nature of operations and Basis of presentation (Details)
3 Months Ended
Apr. 26, 2024
$ / shares
Mar. 31, 2024
Office
$ / shares
Mar. 31, 2023
$ / shares
Summary of significant accounting policies      
Number of full-service community banking offices | Office   28  
Dividends declared | $ / shares $ 0.41 $ 0.41 $ 0.41