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Allowance for Loan Losses - Summary of Credit Exposure for the Loan Portfolio Disaggregated by Loan Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross $ 642,968 $ 1,230,391 $ 1,230,391
Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 635,193 1,220,490  
Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 2,295 5,608  
Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 5,480 4,220  
Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 73  
Real Estate- Residential      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 79,889 64,724 64,724
Real Estate- Residential | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 79,889 64,593  
Real Estate- Residential | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Real Estate- Residential | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 131  
Real Estate- Residential | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Real Estate- Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 151,122 114,884 114,884
Real Estate- Commercial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 148,110 112,260  
Real Estate- Commercial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 226 431  
Real Estate- Commercial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 2,786 2,193  
Real Estate- Commercial | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Real Estate - Construction and Land      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 17,848 15,113 15,113
Real Estate - Construction and Land | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 17,848 15,113  
Real Estate - Construction and Land | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Real Estate - Construction and Land | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Real Estate - Construction and Land | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 232,416 193,927 193,927
Commercial and industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 227,653 186,781  
Commercial and industrial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 2,069 5,177  
Commercial and industrial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 2,694 1,896  
Commercial and industrial | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 73  
Commercial and industrial - PPP      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 156,783 838,847 838,847
Commercial and industrial - PPP | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 156,783 838,847  
Commercial and industrial - PPP | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Commercial and industrial - PPP | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Commercial and industrial - PPP | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 4,910 2,896 $ 2,896
Consumer and other | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 4,910 2,896  
Consumer and other | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Consumer and other | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross 0 0  
Consumer and other | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans, gross $ 0 $ 0