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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) security | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) security | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Derivatives, Fair Value |  |  |  |  |  |
Asset Derivatives | $ 11,326 |  | $ 11,326 |  |  | $ 15,371
Liability Derivatives | 9,777 |  | 9,777 |  |  | 14,099
Interest Receivable | 7,844 |  | 7,844 |  |  | 8,255
Interest Payable | 469 |  | 469 |  |  | 736
Net Amounts of Assets presented in the Balance Sheet | 9,777 |  | 9,777 |  |  | 14,099
Interest expense |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) |  | $ 73 | (48) | $ 73 |  |
Interest income |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) | 150 | $ 126 | 300 | $ 178 |  |
Interest Rate Floor |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Asset Derivatives | 1,303 |  | 1,303 |  |  | 1,678
Interest Rate Swaps |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Asset Derivatives | 10,023 |  | 10,023 |  |  | 13,693
Credit-risk contract |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Posted collateral | 8,030 |  | 8,030 |  |  | 15,360
Net Amounts of Assets presented in the Balance Sheet | 5,729 |  | 5,729 |  |  | 12,421
Derivatives designated as hedging instruments |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Asset Derivatives | 1,303 |  | 1,303 |  |  | 1,678
Liability Derivatives |  |  |  |  |  | 485
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Notional amount | 25,000 |  | 25,000 |  |  |
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets. |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Asset Derivatives | 1,303 |  | 1,303 |  |  | 1,678
Derivatives not designated as hedging instruments |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Asset Derivatives | 10,023 |  | 10,023 |  |  | 13,693
Liability Derivatives | $ 9,777 |  | $ 9,777 |  |  | 13,614
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Number of instruments held | security | 82 |  | 82 |  |  |
Notional amount | $ 401,874 |  | $ 401,874 |  |  | 375,341
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets. |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Asset Derivatives | 10,023 |  | 10,023 |  |  | 13,693
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Liability Derivatives | 9,777 |  | 9,777 |  |  | 13,614
Cash Flow Hedge | Derivatives designated as hedging instruments |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Derivatives terminated | 25 |  | 25 |  |  |
Notional amount | $ 50,000 |  | $ 50,000 |  |  |
Cash Flow Hedge | Derivatives designated as hedging instruments | Other Liabilities. |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Liability Derivatives |  |  |  |  |  | $ 485
Forecast | Cash Flow Hedge | Interest income |  |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) |  |  |  |  | $ 536 |

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