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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($)
Derivatives, Fair Value |  |  |  |
Asset Derivatives | $ 18,191 |  | $ 5,672 |
Liability Derivatives | 16,935 |  | 4,680 |
Interest Receivable | 8,595 |  | 6,981 |
Interest Payable | 1,289 |  | 1,277 |
Net Amounts of Assets presented in the Balance Sheet | 16,935 |  | 4,680 |
Interest income |  |  |  |
Derivatives, Fair Value |  |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) | 149 |  |  |
Interest Rate Floor |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 1,845 |  | 944 |
Interest Rate Swaps |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 16,346 |  | 4,728 |
Credit-risk contract |  |  |  |
Derivatives, Fair Value |  |  |  |
Posted collateral | 16,450 |  | 4,140 |
Net Amounts of Assets presented in the Balance Sheet | 4 |  | 48 |
Derivatives designated as hedging instruments |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 1,845 |  | 944 |
Liability Derivatives | 592 |  |  |
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |  |
Derivatives, Fair Value |  |  |  |
Notional amount | 25,000 |  |  |
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 1,845 |  | 944 |
Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 16,346 |  | 4,728 |
Liability Derivatives | $ 16,343 |  | 4,680 |
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |  |
Derivatives, Fair Value |  |  |  |
Number of instruments held | security | 64 |  |  |
Notional amount | $ 355,594 |  |  | $ 126,574
Interest Receivable |  |  | 211 |
Interest Payable |  |  | 211 |
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 16,346 |  | 4,728 |
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |  |
Derivatives, Fair Value |  |  |  |
Liability Derivatives | 16,343 |  | $ 4,680 |
Cash Flow Hedge | Derivatives designated as hedging instruments |  |  |  |
Derivatives, Fair Value |  |  |  |
Notional amount | 50,000 |  |  |
Cash Flow Hedge | Derivatives designated as hedging instruments | Other Liabilities. |  |  |  |
Derivatives, Fair Value |  |  |  |
Liability Derivatives | $ 592 |  |  |
Forecast | Cash Flow Hedge | Interest expense |  |  |  |
Derivatives, Fair Value |  |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) |  | $ 134 |  |
Forecast | Cash Flow Hedge | Interest income |  |  |  |
Derivatives, Fair Value |  |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) |  | $ 531 |  |

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