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Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Rental Income and Operating Expenses (Details) - Commercial Real Estate [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Rental income | $ 11,224 | $ 10,340 | $ 9,975
Operating expense | $ 10,868 | $ 9,863 | $ 8,727

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