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Deposits - Summary of Deposit Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Noninterest-bearing checking accounts $ 1,597,262 $ 630,359
Interest-bearing checking and money market accounts 2,627,669 1,198,012
Savings deposits 700,480 303,166
Retail certificates of deposit less than $250,000 912,006 631,253
Retail certificates of deposit greater than $250,000 210,424 107,535
Total $ 6,047,841 $ 2,870,325