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Summary of significant accounting policies - Nature of operations and Basis of presentation (Details)		3 Months Ended						9 Months Ended
	Oct. 31, 2025 $ / shares	Sep. 30, 2025 $ / shares	Jun. 30, 2025 $ / shares	Mar. 31, 2025 $ / shares	Sep. 30, 2024 $ / shares	Jun. 30, 2024 $ / shares	Mar. 31, 2024 $ / shares	Sep. 30, 2025 Office $ / shares	Sep. 30, 2024 $ / shares
Summary of significant accounting policies
Number of full-service community banking offices | Office								39
Dividends declared		$ 0.62	$ 0.62	$ 0.62	$ 0.62	$ 0.41	$ 0.41	$ 1.86	$ 1.44
Third quarter dividend | Subsequent events
Summary of significant accounting policies
Dividend declared date	Oct. 31, 2025
Dividends declared	$ 0.6175
Dividend payable date	Dec. 15, 2025
Dividend record date	Nov. 28, 2025

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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
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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-Publisher FASB
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