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Troubled Debt Restructures - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Contract
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Contract
Dec. 31, 2021
USD ($)
Contract
Mar. 31, 2021
Contract
Financing Receivable Modifications [Line Items]          
Current outstanding loans modified | $ $ 3,300,000   $ 3,300,000 $ 3,800,000  
Number of contracts on non-accruing basis | Contract 1     1  
Outstanding balance of TDRs non accruing basis | $ $ 38,000   $ 38,000 $ 39,000  
Number of TDR's payment default | Contract     1   0
TDR is defined as being past due 90 days        
Allowance for loan loss on TDR | $ $ 155,000 $ 139,000      
Total COVID-19 modifications [Member]          
Financing Receivable Modifications [Line Items]          
Number of Contracts | Contract 0     0