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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |
Maturity period of highly liquid debt instruments | 3 months |
Loans past due, minimum period | 90 days |
Loans receivable | $ 26,208 | $ 30,893
Accrued interest, before allowance for credit loss | 4,400 |
Allowance for credit loss | $ 48,600 |
Computer Software And Equipment |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Estimated depreciable life of assets (years) | 3 years |
Furniture, Fixtures and Other Electronic Equipment |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Estimated depreciable life of assets (years) | 5 years |
Building Improvements |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Estimated depreciable life of assets (years) | 10 years |
Buildings |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Estimated depreciable life of assets (years) | 30 years |

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- Definition Amount, before allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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