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Deposits - Summary of certificates of deposit by maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deposits [Abstract]    
2020 $ 3,225,332  
2021 1,964,211  
2022 902,403  
2023 641,180  
2024 572,449  
2025 and thereafter 539,354  
Total certificates of deposit $ 7,844,929 $ 7,674,797