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Mergers and acquisitions - Pro Forma Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Combinations [Abstract] |  |  |  |
Net interest income | $ 83,641 | $ 90,195 | $ 252,849 | $ 260,353
Total revenues | 71,214 | 126,918 | 272,375 | 343,425
Net income | $ (12,428) | $ 36,723 | $ 19,526 | $ 83,072

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