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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024
Securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | $ 33,000,000 | $ 97,000,000
Residential Consumer Loans |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 2,000,000,000.00 | 4,870,000,000
Total Residential Investor Loans |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 449,000,000 | 1,230,000,000
HEIs |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Acquisitions | 500,000 | 1,000,000
MSRs and Other Asset Class |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Acquisitions | $ 0 | $ 200,000

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