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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
	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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
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