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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 1,101 $ 2,499
Recorded Investment With No Allowance 387 1,291
Recorded Investment With Allowance 659 677
Total Recorded Investment 1,046 1,968
Related Allowance 4 222
Average Recorded Investment 1,456 4,630
Interest Income Recognized 50 147
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 123 354
Recorded Investment With No Allowance 124 134
Recorded Investment With Allowance   208
Total Recorded Investment 124 342
Related Allowance   208
Average Recorded Investment 327 1,397
Interest Income Recognized 7 23
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 117 433
Recorded Investment With No Allowance 92 233
Recorded Investment With Allowance 20 59
Total Recorded Investment 112 292
Related Allowance   9
Average Recorded Investment 118 1,945
Interest Income Recognized 4 85
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 733 925
Recorded Investment With No Allowance 166 571
Recorded Investment With Allowance 518 291
Total Recorded Investment 683 862
Related Allowance   2
Average Recorded Investment 758 826
Interest Income Recognized 31 31
Construction & Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance   646
Recorded Investment With No Allowance   330
Total Recorded Investment   330
Average Recorded Investment 123 330
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 127 141
Recorded Investment With No Allowance 6 23
Recorded Investment With Allowance 121 119
Total Recorded Investment 127 142
Related Allowance 4 3
Average Recorded Investment 130 132
Interest Income Recognized $ 8 $ 8