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Loans and Allowance for Loan Losses - Summary of Recorded Investment of PCI Loans, Past Due (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Current Loans $ 81,503 $ 826
Total Loans 84,044 1,085
Commercial and Industrial [Member]    
Financing Receivable, Past Due [Line Items]    
Current Loans 8,947  
Total Loans 8,947  
Construction, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Current Loans 13,929 35
Total Loans 14,015 35
Mortgage, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Current Loans 52,199 584
Total Loans 52,371 808
Mortgage, Residential [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Current Loans 5,393 207
Total Loans 7,671 242
Consumer [Member]    
Financing Receivable, Past Due [Line Items]    
Current Loans 1,035  
Total Loans 1,040  
30-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 726 259
30-89 Days Past Due [Member] | Construction, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 21  
30-89 Days Past Due [Member] | Mortgage, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 148 224
30-89 Days Past Due [Member] | Mortgage, Residential [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 552 $ 35
30-89 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 5  
Greater than 90 Days Past Due & Accruing [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 1,815  
Greater than 90 Days Past Due & Accruing [Member] | Construction, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 65  
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due 24  
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member] | Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Days past due $ 1,726