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Deposits - Summary of Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Noninterest-bearing deposits $ 2,318,706 $ 1,840,424
Interest-bearing demand deposits 4,822,382 3,702,019
Savings deposits 624,685 571,948
Time deposits 2,362,784 1,806,684
Total deposits $ 10,128,557 $ 7,921,075