Fair Value Measurements and Disclosures - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available-for-sale, Estimated Fair Value	$ 44,071	$ 24,005
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	$ 44,100	$ 24,000
Paycheck Protection Program Loans Federal Borrowings | Small Business Administration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Paycheck protection program loans, fixed interest rate	0.35%