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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 3,860 $ 7,425
Recorded Investment with no Allowance 2,507 5,151
Recorded Investment with Allowance 822 1,201
Total recorded investment 3,329 6,352
Related Allowance 236 30
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 424 2,604
Recorded Investment with no Allowance 202 1,965
Recorded Investment with Allowance 211 597
Total recorded investment 413 2,562
Related Allowance 211 4
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,434 3,755
Recorded Investment with no Allowance 1,864 2,673
Recorded Investment with Allowance 111 211
Total recorded investment 1,975 2,884
Related Allowance 20 20
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 872 923
Recorded Investment with no Allowance 430 513
Recorded Investment with Allowance 380 247
Total recorded investment 810 760
Related Allowance 2 1
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 130 143
Recorded Investment with no Allowance 11  
Recorded Investment with Allowance 120 146
Total recorded investment 131 146
Related Allowance $ 3 $ 5