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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($)
Derivatives, Fair Value |  |  |
Asset Derivatives |  | $ 1,924 | $ 661
Liability Derivatives |  | 1,457 | 138
Interest Receivable |  | 7,211 | 7,115
Interest Payable |  | 878 | 1,195
Derivatives designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 597 | 553
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Notional amount |  | 25 |
Asset Derivatives |  |  | 553
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 597 |
Derivatives designated as hedging instruments | Interest Rate Swaps | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 1,328 | 108
Derivatives designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |
Derivatives, Fair Value |  |  |
Liability Derivatives |  | 1,468 | 138
Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 1,328 | 108
Liability Derivatives |  | $ 1,468 | 138
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Number of instruments held | security |  | 12 |
Notional amount |  | $ 79,667 |
Interest Receivable |  |  | 8
Interest Payable |  |  | $ 8
Forecast | Cash Flow Hedge | Interest income |  |  |
Derivatives, Fair Value |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 64 |  |

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