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Deposits (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Time Deposits, Fiscal Year Maturity [Abstract]    
2021 $ 2,810,182,000  
2022 563,181,000  
2023 125,703,000  
2024 11,666,000  
2025 12,684,000  
Thereafter 1,216,000  
Time deposits, Total 3,524,632,000 $ 3,941,445,000
Time Deposits, $250,000 or greater 808,300,000 995,300,000
Deposit accounts in overdraft status $ 920,000 $ 1,900,000