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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
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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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- 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 + Details
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