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Commitments and Contingencies - Additional Information (Detail) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Other Commitments [Line Items]    
Outstanding loan commitments $ 294,800,000 $ 126,000,000.0
Future commitments outstanding related to investments 7,800,000  
Performance Stand-by Letters of Credit [Member]    
Other Commitments [Line Items]    
Outstanding stand-by letters of credit 655,000 0
Financial Stand-by Letters of Credit [Member]    
Other Commitments [Line Items]    
Outstanding stand-by letters of credit 9,400,000 6,100,000
Other Liabilities [Member]    
Other Commitments [Line Items]    
Reserves for unfunded commitments to borrowers $ 352,000 $ 0