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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) - Interest income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Loss Reclassified from Accumulated OCI into Income |  | $ (31)
Cash Flow Hedge | Interest Rate Floor |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Loss Recognized in OCI on Derivative | $ 427 | 474
Amount of Gain Recognized in OCI Included Component | 532 | 827
Amount of Gain Recognized in OCI Excluded Component | (105) | (353)
Amount of Loss Reclassified from Accumulated OCI into Income | (16) | (31)
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component | $ (16) | $ (31)

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge excluded in assessment of hedge effectiveness. + References No definition available. + Details
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- Definition The loss relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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