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Adoption of New Accounting Standard - Summary of Impact to the Consolidated Balance Sheet as the Result of Adopting ASC 326 (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |  |  |
Loans held for investment, net of deferred fees and costs | $ 2,439,956 |  |  | $ 2,399,092 | [1] |  |  |
Allowance for credit losses | (49,631) | $ (38,567) |  | (30,740) | [1] | $ (20,534) | $ (17,242) | $ (12,121)
Deferred tax asset, net | 13,237 |  |  | 12,227 | [1] |  |  |
Liabilities: |  |  |  |  |  |  |  |
Reserve for unfunded commitments | 4,000 |  | $ 3,700 | 1,812 |  |  |  |
Stockholders' Equity: |  |  |  |  |  |  |  |
Retained earnings | 38,916 |  |  | 97,682 | [1] |  |  |
January 1, 2023 Post-ASC 326 Adoption [Member] |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Loans held for investment, net of deferred fees and costs |  |  | 2,399,757 |  |  |  |  |
Allowance for credit losses | $ (7,400) |  | (38,158) |  |  |  |  |
Deferred tax asset, net |  |  | 14,561 |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Reserve for unfunded commitments |  |  | 5,504 |  |  |  |  |
Stockholders' Equity: |  |  |  |  |  |  |  |
Retained earnings |  |  | $ 89,571 |  |  |  |  |
Impact of ASC 326 Adoption [Member] |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Loans held for investment, net of deferred fees and costs |  |  |  | 665 |  |  |  |
Allowance for credit losses |  |  |  | (7,418) |  |  |  |
Deferred tax asset, net |  |  |  | 2,334 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Reserve for unfunded commitments |  |  |  | 3,692 |  |  |  |
Stockholders' Equity: |  |  |  |  |  |  |  |
Retained earnings |  |  |  | $ (8,111) |  |  |  |
[1] | Derived from audited December 31, 2022 Consolidated Financial Statements.

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