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Deposits - Schedule of Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Demand deposits $ 3,985,178 $ 3,746,654
Savings deposits 2,282,701 1,994,366
Certificates and other time deposits of $100,000 or more 593,592 468,895
Other certificates and time deposits 646,682 581,894
Brokered deposits 246,440 380,721
Total Deposits 7,754,593 7,172,530
Cash amount that exceeded federally insured limits $ 3,800,000 $ 3,200,000