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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, 2021 USD ($) | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($)
Derivatives, Fair Value |  |  |
Asset Derivatives |  | $ 15,371 | $ 5,672
Liability Derivatives |  | 14,099 | 4,680
Interest Receivable |  | 8,255 | 6,981
Interest Payable |  | 736 | 1,277
Net Amounts of Assets presented in the Balance Sheet |  | 14,099 | 4,680
Interest income |  |  |
Derivatives, Fair Value |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) |  | 150 | 42
Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 1,678 | 944
Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 13,693 | 4,728
Credit-risk contract |  |  |
Derivatives, Fair Value |  |  |
Posted collateral |  | 15,360 | 4,140
Net Amounts of Assets presented in the Balance Sheet |  | 79 | 48
Derivatives designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 1,678 | 944
Liability Derivatives |  | 485 |
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Notional amount |  | 25,000 |
Asset Derivatives |  |  | 944
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 1,678 |
Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 13,693 | 4,728
Liability Derivatives |  | $ 13,614 | 4,680
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Number of instruments held | security |  | 73 |
Notional amount |  | $ 375,341 | 172,096
Interest Receivable |  |  | 235
Interest Payable |  |  | 235
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 13,693 | 4,728
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |
Derivatives, Fair Value |  |  |
Liability Derivatives |  | 13,614 | $ 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 |  | $ 485 |
Forecast | Cash Flow Hedge | Interest income |  |  |
Derivatives, Fair Value |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) | $ 50,000 |  |

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