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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($)
Derivatives, Fair Value |  |  |  |
Asset Derivatives | $ 16,645 |  | $ 5,672 |
Liability Derivatives | 14,762 |  | 4,680 |
Interest Receivable | 7,283 |  | 6,981 |
Interest Payable | 1,336 |  | 1,277 |
Net Amounts of Assets presented in the Balance Sheet | 14,762 |  | 4,680 |
Interest income |  |  |  |
Derivatives, Fair Value |  |  |  |
Amount of gain or (loss) reclassified as a reduction to interest income | 52 |  |  |
Interest Rate Floor |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 1,966 |  | 944 |
Interest Rate Swaps |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 14,679 |  | 4,728 |
Credit-risk contract |  |  |  |
Derivatives, Fair Value |  |  |  |
Posted collateral | 13,090 |  | 5,120 |
Net Amounts of Assets presented in the Balance Sheet | 83 |  | 48 |
Derivatives designated as hedging instruments |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 1,966 |  | 944 |
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |  |
Derivatives, Fair Value |  |  |  |
Notional amount | 25 |  |  |
Asset Derivatives |  |  | 944 |
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets. |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 1,966 |  |  |
Derivatives designated as hedging instruments | Interest Rate Swaps | Other Assets. |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 14,679 |  | 4,728 |
Derivatives designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |  |
Derivatives, Fair Value |  |  |  |
Liability Derivatives | 14,762 |  | 4,680 |
Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value |  |  |  |
Asset Derivatives | 14,679 |  | 4,728 |
Liability Derivatives | $ 14,762 |  | 4,680 |
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |  |
Derivatives, Fair Value |  |  |  |
Number of instruments held | security | 44 |  |  |
Notional amount | $ 225,376 |  |  | $ 79,667
Interest Receivable |  |  | 65 |
Interest Payable |  |  | $ 65 |
Forecast | Cash Flow Hedge | Interest income |  |  |  |
Derivatives, Fair Value |  |  |  |
Amount of gain or (loss) reclassified as a reduction to interest income |  | $ 64 |  |

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