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Fair Value Measurements and Disclosures - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available-for-sale, Estimated Fair Value	$ 24,005	$ 3,818
Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available-for-sale, Estimated Fair Value	$ 24,000	$ 3,800
Payroll Protection Program Loans Federal Borrowings | Small Business Administration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Payroll protection program loans, fixed interest rate	0.35%

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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