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Deposits - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Banking and Thrift, Other Disclosure [Abstract]      
Deposits $ 20,903,456   $ 21,653,188
Brokered deposits 10,300,000   10,300,000
Retail and other deposits 10,600,000   11,400,000
Stable interest-bearing deposits, total 6,800,000   7,600,000
Brokered deposit placement fee 3,000 $ 3,000  
Third party broker fees paid 0 $ 3,000  
Deposits exceeding FDIC insurance limits 492,000   478,000
Accrued interest on deposits $ 67,000   $ 91,000