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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |
Off-balance sheet risk description | As of December 31, 2021, and 2020, the Company had no off-balance sheet risk such as foreign exchange contracts, option contracts, or other hedging arrangements. |
Off-balance sheet risk | $ 0 | $ 0
CARES act eliminated percentage on limitation of taxable income | 80.00% |
Percentage of adjusted taxable income plus business interest income | 50.00% |
Percentage of limitation on adjusted taxable income plus business interest income under 2017 tax act | 30.00% |
CARES Act Charitable Deduction Description | CARES Act raises the corporate charitable deduction limit to 25% of taxable income and makes qualified improvement property generally eligible for 15-year cost-recovery and 100% bonus depreciation. |
Percentage of tax benefit recognized | 50.00% |
Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
CARES act net operating loss carryback period | 5 years |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Debt securities, available-for-sale, unrealized gains (losses) | $ 0 | $ 0
ASU No. 2016-12 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, immaterial effect | true |
ASU No. 2016-13 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |
Change in accounting principle, accounting standards update, immaterial effect | true |
ASU No. 2018-15 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |
Change in accounting principle, accounting standards update, immaterial effect | true |
ASU No. 2018-13 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |
Change in accounting principle, accounting standards update, immaterial effect | true |
ASU No. 2018-18 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |
Change in accounting principle, accounting standards update, immaterial effect | true |

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