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Deposits - Summary of certificates of deposit by maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Deposits [Abstract]    
2022 $ 3,914,729  
2023 1,112,216  
2024 747,887  
2025 573,506  
2026 508,775  
2027 and thereafter 233,576  
Total certificates of deposit $ 7,090,689 $ 6,712,149