v3.23.2

Fair Value of Assets and Liabilities - Quantitative Information about Significant Unobservable Inputs Used for Fair Value Measurements (Detail) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2023 | Dec. 31, 2022
Level 3 Inputs | Minimum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Total market servicing rates (percent per annum on outstanding principal balance) | 0.62% | 0.62%
Level 3 Inputs | Maximum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Total market servicing rates (percent per annum on outstanding principal balance) | 0.62% | 0.62%
Level 3 Inputs | Weighted- Average | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Total market servicing rates (percent per annum on outstanding principal balance) | 0.62% | 0.62%
Discount rates | Minimum |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.074 |
Discount rates | Minimum | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.055 |
Discount rates | Maximum |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.074 |
Discount rates | Maximum | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.066 |
Discount rates | Weighted- Average |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.074 |
Discount rates | Weighted- Average | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.058 |
Discount rates | Level 3 Inputs | Minimum | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 8.60% | 8.80%
Discount rates | Level 3 Inputs | Minimum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 7.50% | 7.50%
Discount rates | Level 3 Inputs | Maximum | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 16.70% | 17.10%
Discount rates | Level 3 Inputs | Maximum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 16.40% | 16.40%
Discount rates | Level 3 Inputs | Weighted- Average | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 12.70% | 12.70%
Discount rates | Level 3 Inputs | Weighted- Average | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 9.90% | 10.10%
Net cumulative expected loss rates | Minimum | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.072 |
Net cumulative expected loss rates | Maximum | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.091 |
Net cumulative expected loss rates | Weighted- Average | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.083 |
Net cumulative expected loss rates | Level 3 Inputs | Minimum | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 2.20% | 2.10%
Net cumulative expected loss rates | Level 3 Inputs | Minimum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 2.00% | 2.10%
Net cumulative expected loss rates | Level 3 Inputs | Maximum | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 10.20% | 9.80%
Net cumulative expected loss rates | Level 3 Inputs | Maximum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 36.40% | 36.70%
Net cumulative expected loss rates | Level 3 Inputs | Weighted- Average | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 6.30% | 5.70%
Net cumulative expected loss rates | Level 3 Inputs | Weighted- Average | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 15.40% | 15.60%
Cumulative expected prepayment rates | Minimum | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.330 |
Cumulative expected prepayment rates | Maximum | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.340 |
Cumulative expected prepayment rates | Weighted- Average | Other asset-backed securities related to Structured Program transactions |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.334 |
Cumulative expected prepayment rates | Level 3 Inputs | Minimum | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 22.00% | 26.20%
Cumulative expected prepayment rates | Level 3 Inputs | Minimum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 17.00% | 15.80%
Cumulative expected prepayment rates | Level 3 Inputs | Maximum | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 30.70% | 35.30%
Cumulative expected prepayment rates | Level 3 Inputs | Maximum | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 47.70% | 47.20%
Cumulative expected prepayment rates | Level 3 Inputs | Weighted- Average | Loans Held for Investment |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 27.30% | 30.80%
Cumulative expected prepayment rates | Level 3 Inputs | Weighted- Average | Servicing Assets |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, percent | 32.90% | 35.90%

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- Definition Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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