Fair Value Disclosures - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Loans	Dec. 31, 2020 USD ($) Loans	Dec. 31, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets transfer between Level 2 and Level 3	$ 0	$ 0	$ 0
Other real estate owned, total	$ 0	$ 119,000
Minimum [Member] | Measurement Input, Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt discounts, percentage	5
Maximum [Member] | Measurement Input, Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt discounts, percentage	25
Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of loans held-for-sale | Loans | Loans	0	0
Recognized credit losses	$ 0	$ 0	$ 0