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Deposits - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Banking and Thrift, Other Disclosure [Abstract]          
Deposits $ 21,276,748   $ 21,276,748   $ 20,828,124
Brokered deposits 10,200,000   10,200,000   10,100,000
Retail and other deposits 11,100,000   11,100,000   10,700,000
Stable interest-bearing deposits, total 8,000,000   8,000,000   7,300,000
Brokered deposit placement fee 3,000 $ 4,000 10,000 $ 12,000  
Third party broker fees paid 4,000 $ 10,000 8,000 $ 11,000  
Deposits exceeding FDIC insurance limits 538,000   538,000   743,000
Accrued interest on deposits $ 48,000   $ 48,000   $ 35,000