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