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Derivatives and hedging activities - Effect of Derivative Instruments Not Designated as Hedging Instruments on the Statements of Income and Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fee Income | Fee Income
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized in Income	$ 18	$ 384
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized in Income	(43)	(161)
Derivatives not designated as hedging instruments | Interest Rate Products | Other income / (expense)
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized in Income	(42)	$ (161)
Derivatives not designated as hedging instruments | Other Contracts | Other income / (expense)
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized in Income	$ (1)

X

- 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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- Definition

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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