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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance $ 7,425 $ 6,972 $ 4,621
Recorded Investment With No Allowance 5,151 5,483 3,122
Recorded Investment With Allowance 1,201 588 738
Total Recorded Investment 6,352 6,071 3,860
Related Allowance 30 34 101
Average Recorded Investment 5,770 5,676 6,369
Interest Income Recognized 119 134 113
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 2,604 2,982 815
Recorded Investment With No Allowance 1,965 2,541 383
Recorded Investment With Allowance 597 16 36
Total Recorded Investment 2,562 2,557 419
Related Allowance 4 16 36
Average Recorded Investment 2,305 2,054 1,511
Interest Income Recognized 66 68 37
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 3,755 2,952 2,616
Recorded Investment With No Allowance 2,673 2,471 1,976
Recorded Investment With Allowance 211 176 433
Total Recorded Investment 2,884 2,647 2,409
Related Allowance 20 17 64
Average Recorded Investment 2,569 2,517 3,531
Interest Income Recognized 13 11 19
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 923 1,024 1,190
Recorded Investment With No Allowance 513 457 763
Recorded Investment With Allowance 247 396 269
Total Recorded Investment 760 853 1,032
Related Allowance 1 1 1
Average Recorded Investment 782 1,093 1,327
Interest Income Recognized 33 54 $ 57
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 143 14  
Recorded Investment With No Allowance   14  
Recorded Investment With Allowance 146    
Total Recorded Investment 146 14  
Related Allowance 5    
Average Recorded Investment 114 12  
Interest Income Recognized $ 7 $ 1