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Allowance for Credit Losses on Loans - Summary of Loans Deemed Impaired and Specific Reserves Allocated by Class (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance   $ 3,072
Recorded Investment With No Allowance   783
Recorded Investment With Allowance   2,289
Related Allowance   173
Average Recorded Investment $ 4,400  
Interest Income 91  
Real Estate - Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance   503
Recorded Investment With Allowance   503
Related Allowance   18
Average Recorded Investment 1,391  
Interest Income 24  
Other Real Estate Construction [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance   183
Recorded Investment With No Allowance   183
Real Estate - Residential [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance   2,318
Recorded Investment With No Allowance   572
Recorded Investment With Allowance   1,746
Related Allowance   131
Average Recorded Investment 2,008  
Interest Income 63  
Home Equity [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance   28
Recorded Investment With No Allowance   28
Average Recorded Investment 32  
Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance   18
Recorded Investment With Allowance   18
Related Allowance   22
Average Recorded Investment 969  
Interest Income $ 4  
Consumer Loans [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance   22
Recorded Investment With Allowance   22
Related Allowance   $ 2