Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfer of assets into or out of level 3	$ 0	$ 0
Transfer of liabilities into or out of level 3	0	0
Collateral dependent impaired loans categorized as Level 3	11,939,000	14,532,000
Specific allocation for collateral dependent impaired loans	2,184,000	1,657,000
Collateral Dependent [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific allocation for collateral dependent impaired loans	2,184,000	1,657,000
Level 3 [Member] | Collateral Dependent [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans categorized as Level 3	$ 8,527,000	$ 7,703,000