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Commitments and Contingencies - Additional Information (Detail) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Other Commitments [Line Items]    
Outstanding loan commitments $ 315,700,000 $ 126,000,000
Reserve for unfunded commitments 0 0
Performance Stand-by Letters of Credit [Member]    
Other Commitments [Line Items]    
Outstanding stand-by letters of credit 7,300,000 0
Financial Stand-by Letters of Credit [Member]    
Other Commitments [Line Items]    
Outstanding stand-by letters of credit $ 4,800,000 $ 6,100,000