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Derivatives and hedging activities - Effect of Derivative Instruments Not Designated as Hedging Instruments on the Consolidated Statements of Income and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fee Income | Fee Income
Derivative Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized in Income on Derivatives	$ 106	$ 18
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized in Income on Derivatives	(63)	(43)
Derivatives not designated as hedging instruments | Interest rate products | Other income / (expense)
Derivative Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized in Income on Derivatives	$ (63)	(42)
Derivatives not designated as hedging instruments | Other contracts | Other income / (expense)
Derivative Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized in Income on Derivatives		$ (1)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4CC
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC

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