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Other Derivatives - Cash flow hedges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net unrealized gain (loss) on derivatives | $ (2,049) | $ (2,731) | $ 2,033
Cash Flow Hedge | Interest Rate Product |  |  |
Net unrealized gain (loss) on derivatives | (1,510) | (1,812) |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | (1,146) | 1,994 |
Cash Flow Hedge | Interest Rate Product | Interest Expense |  |  |
Net unrealized gain (loss) on derivatives | (1,510) | (1,812) |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | (1,146) | 1,165 |
Cash Flow Hedge | Interest Rate Product | Gain on sale of investment securities |  |  |
Net unrealized gain (loss) on derivatives | 0 |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | $ 0 | $ 829 |

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