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Deposits - Summary of Major Types of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]    
Non-interest-bearing $ 2,467,952 $ 2,133,195
Interest-bearing checking 4,013,565 3,646,866
Money market deposit 816,691 783,521
Savings 1,620,447 1,491,251
Time deposits 855,442 1,372,783
Total deposits $ 9,774,097 $ 9,427,616