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Derivatives and hedging activities - Effect of Other Derivative Instruments on the Income Statement (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Interest Rate Swaps | Other non-interest income
Derivative Instruments, Gain (Loss)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 49	$ (79)
Fee Income | Other income/(expense)
Derivative Instruments, Gain (Loss)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 53	$ 792

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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

No definition available.

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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://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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