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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, 2020 USD ($) | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($)
Derivatives, Fair Value |  |  |
Asset Derivatives |  | $ 5,672 | $ 661
Liability Derivatives |  | 4,680 | 138
Interest Receivable |  | 6,981 | 7,115
Interest Payable |  | 1,277 | 1,195
Interest income |  |  |
Derivatives, Fair Value |  |  |
Amount of gain or (loss) reclassified as a reduction to interest income |  | 42 | 13
Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | $ 944 | 553
Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Number of instruments held | security |  | 30 |
Asset Derivatives |  | $ 4,728 | 108
Derivatives designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 944 | 553
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Notional amount |  | 25,000 |
Asset Derivatives |  |  | 553
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 944 |
Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 4,728 | 108
Liability Derivatives |  | 4,680 | 138
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Notional amount |  | 172,096 |
Interest Receivable |  |  | 55
Interest Payable |  |  | 55
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 4,728 | 108
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |
Derivatives, Fair Value |  |  |
Liability Derivatives |  | $ 4,680 | $ 138
Forecast | Cash Flow Hedge | Interest Rate Floor | Interest income |  |  |
Derivatives, Fair Value |  |  |
Amount of gain or (loss) reclassified as a reduction to interest income | $ 64 |  |

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