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Deposits - Schedule of Interest-Bearing Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Interest-bearing deposits:    
Savings deposits $ 10,595,108 $ 4,383,953
Demand deposits 2,546,978 1,912,452
Time deposits 2,465,263 969,387
Total interest-bearing deposits 15,607,349 7,265,792
Brokered deposits 2,618,186 1,026,400
Brokered time deposits 2,432,679 940,000
Brokered demand deposits 185,507 86,400
Uninsured deposits $ 21,524 $ 20,842