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Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Rental Income and Operating Expenses (Details) - Real Estate Investment [Member] - Commercial Real Estate [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Rental income | $ 2,911 | $ 2,437 | $ 8,379 | $ 7,750
Operating expense | $ 2,690 | $ 2,381 | $ 8,038 | $ 7,120

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