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Deposits - Summary of Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Mortgage Banking [Abstract]    
Noninterest-bearing deposits $ 3,685,048 $ 2,551,770
Interest-bearing demand deposits 5,830,288 4,832,945
Savings deposits 847,857 667,821
Time deposits 1,695,888 2,160,632
Total deposits $ 12,059,081 $ 10,213,168