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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, 2022 USD ($) | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($)
Derivatives, Fair Value |  |  |
Interest rate floor and swaps |  | $ 9,870 | $ 15,371
Liability Derivatives |  | 8,818 | 14,099
Interest Receivable |  | 8,528 | 8,255
Interest Payable |  | 408 | 736
Net Amounts of Assets presented in the Balance Sheet |  | 8,818 | 14,099
Interest expense |  |  |
Derivatives, Fair Value |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) |  | (48) | 13
Interest income |  |  |
Derivatives, Fair Value |  |  |
Amount of gain or (loss) reclassified as a increase to interest income (expense) |  | 607 | 477
Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Interest rate floor and swaps |  | 844 | 1,678
Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Interest rate floor and swaps |  | 9,026 | 13,693
Credit-risk contract |  |  |
Derivatives, Fair Value |  |  |
Posted collateral |  | 7,380 | 15,360
Net Amounts of Assets presented in the Balance Sheet |  | 5,600 | 12,421
Derivatives designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Interest rate floor and swaps |  | 844 | 1,678
Liability Derivatives |  |  | 485
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Notional amount |  | 25,000 |
Interest rate floor and swaps |  |  | 1,678
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Interest rate floor and swaps |  | 844 |
Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Interest rate floor and swaps |  | 9,026 | 13,693
Liability Derivatives |  | $ 8,811 | 13,614
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Number of instruments held | security |  | 84 |
Notional amount |  | $ 392,677 | 375,341
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Interest rate floor and swaps |  | 9,026 | 13,693
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |
Derivatives, Fair Value |  |  |
Liability Derivatives |  | 8,811 | 13,614
Cash Flow Hedge | Derivatives designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Derivatives terminated |  | 25 |
Notional amount |  | $ 50,000 |
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) | $ 452 |  |

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