Loan Servicing - Narrative (Details) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024
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