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Loan Servicing - Narrative (Details) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid principal balances of loans serviced for others totaled | $ 1,410 | $ 1,440 |
Measurement Input, Discount Rate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Servicing asset, measurement input |  |  | 0.110
Minimum | Measurement Input, Discount Rate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Servicing asset, measurement input | 0.085 |  |
Minimum | Measurement Input, Prepayment Rate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Servicing asset, measurement input | 0.059 |  | 0.060
Maximum | Measurement Input, Discount Rate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Servicing asset, measurement input | 0.110 |  |
Maximum | Measurement Input, Prepayment Rate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Servicing asset, measurement input | 0.121 |  | 0.120

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