January 2027 Notes [Member] January 2027 Notes Secured Credit Facility with Sumitomo Mitsui Banking Corporation (SMBC) [Member] Secured Credit Facility with Sumitomo Mitsui Banking Corporation (SMBC) Optional Redemption Provision Risk [Member] Optional Redemption Provision Risk Unsecured Note Risk [Member] Unsecured Note Risk 2028 Convertible Notes [Member] 2028 Convertible Notes 2016 Convertible Notes [Member] 2016 Convertible Notes Total Senior Securities [Member] Total Senior Securities Debt Instrument, Name [Domain] Securitized Credit Facility with Wells Fargo Capital Finance [Member] Securitized Credit Facility with Wells Fargo Capital Finance Entity Registrant Name 2031 Asset-Backed Notes [Member] 2031 Asset-Backed Notes March 2026 A Notes [Member] March 2026 A Notes April 2019 Notes [Member] April 2019 Notes June 2025 Notes [Member] June 2025 Notes Outstanding Debt Risk [Member] Outstanding Debt Risk 2025 Notes [Member] 2025 Notes Structurally Subordinated Note Risk [Member] Structurally Subordinated Note Risk Small Business Administration Debentures (HT III) [Member] Small Business Administration Debentures (HT III) 2022 Notes [Member] 2022 Notes Small Business Administration Debentures (HC IV) [Member] Small Business Administration Debentures (HC IV) 2022 Convertible Notes [Member] 2022 Convertible Notes 2027 Asset-Backed Notes [Member] 2027 Asset-Backed Notes March 2026 B Notes [Member] March 2026 B Notes June 2025 3-Year Notes [Member] June 2025 3-Year Notes 2024 Notes [Member] 2024 Notes Secured Credit Facility With MUFG Bank Ltd. (MUFG) [Member] Secured Credit Facility With MUFG Bank Ltd. (MUFG) Small Business Administration Debentures (SBIC V) [Member] Small Business Administration Debentures (SBIC V) September 2026 Notes [Member] September 2026 Notes 2028 Asset-Backed Notes [Member] 2028 Asset-Backed Notes 2021 Asset-Backed Notes [Member] 2021 Asset-Backed Notes Amendment Flag September 2019 Notes [Member] September 2019 Notes Market Interest Rate Risk [Member] Market Interest Rate Risk Note Repurchase Risk [Member] Note Repurchase Risk Note Limited Protection Risk [Member] Note Limited Protection Risk Credit Rating Risk [Member] Credit Rating Risk 2033 Notes [Member] 2033 Notes Small Business Administration Debentures (HT II) [Member] Small Business Administration Debentures (HT II) Document Type June 2030 Notes [Member] June 2030 Notes February 2025 Notes [Member] February 2025 Notes July 2024 Notes [Member] July 2024 Notes Note Trading Market Risk [Member] Note Trading Market Risk Entity Central Index Key February 2029 Notes [Member] February 2029 Notes DTC Procedure Risk [Member] DTC Procedure Risk