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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 2,442 $ 2,499
Recorded Investment with no Allowance 1,257 1,291
Recorded Investment with Allowance 646 677
Total recorded investment 1,903 1,968
Related Allowance 210 222
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 351 354
Recorded Investment with no Allowance 132 134
Recorded Investment with Allowance 205 208
Total recorded investment 337 342
Related Allowance 205 208
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 396 433
Recorded Investment with no Allowance 230 233
Recorded Investment with Allowance 24 59
Total recorded investment 254 292
Related Allowance   9
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 911 925
Recorded Investment with no Allowance 556 571
Recorded Investment with Allowance 288 291
Total recorded investment 844 862
Related Allowance 2 2
Construction & Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 647 646
Recorded Investment with no Allowance 330 330
Total recorded investment 330 330
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 137 141
Recorded Investment with no Allowance 9 23
Recorded Investment with Allowance 129 119
Total recorded investment 138 142
Related Allowance $ 3 $ 3