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Loans and Allowance for Credit Losses - Modified Payment Status (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment $ 25 $ 69
Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 25  
Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Residential real estate [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 25 69
Residential real estate [Member] | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 25  
Residential real estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Residential real estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Residential real estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Residential real estate [Member] | Senior Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 25 $ 69
Residential real estate [Member] | Senior Lien | Financial Asset, Not Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 25  
Residential real estate [Member] | Senior Lien | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Residential real estate [Member] | Senior Lien | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment 0  
Residential real estate [Member] | Senior Lien | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Post- Modification Outstanding Recorded Investment $ 0