Fair Value Disclosures - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value on a Nonrecurring Basis [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 3,247	$ 3,715
Total assets at fair value on a nonrecurring basis	3,247	3,715
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	3,247	3,715
Total assets at fair value on a nonrecurring basis	$ 3,247	$ 3,715