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Deposits (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Time Deposits, Fiscal Year Maturity [Abstract]    
2019 $ 2,458,837,000  
2020 717,024,000  
2021 246,827,000  
2022 33,925,000  
2023 9,330,000  
Thereafter 2,300,000  
Time deposits, Total 3,468,243,000 $ 2,534,061,000
Time Deposits, $100,000 or More 1,800,000,000 1,300,000,000
Time Deposits, $250,000 or greater 819,300,000 495,600,000
Deposit accounts in overdraft status $ 1,700,000 $ 3,500,000