Fair Value Disclosures - Narrative (Details)	Dec. 31, 2022	Dec. 31, 2021
CRT securities | Minimum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, term	5 years 21 days
CRT securities | Maximum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, term	8 years 8 months 1 day
Measurement Input, Discount Rate
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Loans held-for-sale, measurement input	0	0.978
Measurement Input, Discount Rate | Tax-exempt asset-backed securities | Weighted Average
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, measurement input		0.0260
Debt securities, available-for-sale, term		4 years 7 months 9 days
Measurement Input, Discount Rate | CRT securities | Minimum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, measurement input	0.0667
Measurement Input, Discount Rate | CRT securities | Maximum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, measurement input	0.1137
Measurement Input, Discount Rate | CRT securities | Weighted Average
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, measurement input	0.0824	0.0497
Debt securities, available-for-sale, term	6 years 3 months 3 days	6 years 4 months 6 days