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Deposits - Summary of Deposit Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Non-interest-bearing checking accounts $ 1,041,315 $ 630,359
Interest-bearing checking and money market accounts 2,052,935 1,198,012
Savings deposits 623,331 303,166
Retail certificates of deposit less than $250,000 1,091,003 631,253
Retail certificates of deposit greater than $250,000 185,564 107,535
Total $ 4,994,148 $ 2,870,325