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Derivative instruments and hedging activities - Non-hedging activities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) |  |  |
Amount of net gain (loss) recognized in income on derivatives | $ (2,982) | $ (1,244) | $ 1,273
Forward contracts | Mortgage banking activities |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Amount of net gain (loss) recognized in income on derivatives | (5,027) | (2,254) | 1,213
Interest rate cap | Other operating income |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Amount of net gain (loss) recognized in income on derivatives | 0 | (5) | (4)
Indexed options on deposits | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Amount of net gain (loss) recognized in income on derivatives | 5,462 | 7,898 | 114
Bifurcated embedded options | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Amount of net gain (loss) recognized in income on derivatives | $ (3,417) | $ (6,883) | $ (50)

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