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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Interest rate swap. |  |
Derivatives, Fair Value |  |
Number of instruments held | security | 6 | 5
Notional amount | $ 62,657 | $ 55,928
Derivatives designated as hedging instruments | Other Assets. | Interest Rate Products |  |
Derivatives, Fair Value |  |
Asset Derivatives | 864 | 655
Derivatives designated as hedging instruments | Other Liabilities | Interest Rate Products |  |
Derivatives, Fair Value |  |
Liability Derivatives | 841 | 733
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value |  |
Asset Derivatives | 864 | 655
Liability Derivatives | $ 841 | $ 733

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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