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Summary of significant accounting policies - Nature of operations and Basis of presentation (Details)		3 Months Ended				6 Months Ended
	Jul. 26, 2024 $ / shares	Jun. 30, 2024 $ / shares	Mar. 31, 2024 $ / shares	Jun. 30, 2023 $ / shares	Mar. 31, 2023 $ / shares	Jun. 30, 2024 Office $ / shares	Jun. 30, 2023 $ / shares
Summary of significant accounting policies
Number of full-service community banking offices | Office						44
Dividends declared | $ / shares	$ 0.6175	$ 0.41	$ 0.41	$ 0.41	$ 0.41	$ 0.82	$ 0.82
Increase of dividend compared to prior period	50.60%

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Percentage increase of dividend compared to the prior period.

+ References

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- Definition

The number of full-service community banking offices.

+ References

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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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