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Deposits - Annual Maturities of Certificates of Deposit (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Annual Maturities for Certificates of Deposit    
2019 $ 3,891,081  
2020 857,528  
2021 15,097  
2022 6,878  
2023 4,342  
Thereafter 15,754  
Total certificates of deposit 4,790,680 $ 4,982,271
Certificates of deposit with balances equal to or greater than the FDIC insurance limit of $250,000 $ 782,400 $ 735,700