Financial Instruments - Fair Value Measurement Inputs and Valuation Techniques (Details)	Sep. 30, 2023	Dec. 31, 2022
IRLCs | Pull-through rate | Market pricing
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.935	0.910
IRLCs | Pull-through rate | Market pricing | Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	1.000	1.000
IRLCs | Pull-through rate | Market pricing | Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.697	0.620
MSRs | Prepayment speed | Valuation Technique, Discounted Cash Flow
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.065	0.066
MSRs | Prepayment speed | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.120	0.144
MSRs | Prepayment speed | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.060	0.060
MSRs | Default rates | Valuation Technique, Discounted Cash Flow
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.002	0.001
MSRs | Default rates | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.010	0.005
MSRs | Default rates | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.001	0.000
MSRs | Discount rate | Valuation Technique, Discounted Cash Flow
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.101	0.096
MSRs | Discount rate | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.128	0.124
MSRs | Discount rate | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.100	0.095