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Deposits - Summary of Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Noninterest-bearing deposits $ 2,551,770 $ 2,318,706
Interest-bearing demand deposits 4,832,945 4,822,382
Savings deposits 667,821 624,685
Time deposits 2,160,632 2,362,784
Total deposits $ 10,213,168 $ 10,128,557