Fair Value Presentation - Schedule of Quantitative Information about Level 3 Fair Value Measurements for Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other real estate owned, net	$ 775,000	$ 1,180,000	$ 1,207,000
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total	775,000
Fair Value, Measurements, Nonrecurring [Member] | Valuation Technique Appraisal | Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other real estate owned, net	$ 775,000
Fair Value, Measurements, Nonrecurring [Member] | Valuation Technique Appraisal | Discount Rate [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other Real Estate Owned, net, Range of Inputs	0.06
Fair Value, Measurements, Nonrecurring [Member] | Valuation Technique Appraisal | Discount Rate [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other Real Estate Owned, net, Range of Inputs	0.10