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Loans - Summary of Information Regarding Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 7,974 $ 2,280
Principal Balance 8,337 2,596
Average Investment 3,523 2,274
Interest Recognized 128 67
Recorded Investment 67 97
Principal Balance 68 97
Related Allowance 67 12
Average Investment 59 278
Interest Recognized   3
Recorded Investment 8,041 2,377
Principal Balance 8,405 2,693
Average Investment 3,582 2,552
Interest Recognized 128 70
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 5,840 701
Principal Balance 5,840 701
Average Investment 1,824 658
Interest Recognized 87 40
Commercial Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment   303
Principal Balance   303
Average Investment 126 303
Commercial Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,091 161
Principal Balance 1,091 161
Average Investment 488 46
Interest Recognized 23 2
Residential real estate and consumer First mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,016 1,085
Principal Balance 1,350 1,375
Average Investment 1,056 1,235
Interest Recognized 18 25
Recorded Investment 62 91
Principal Balance 62 91
Related Allowance 62 6
Average Investment 43 154
Interest Recognized   3
Consumer Home Equity and Lines of Credit [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 27 30
Principal Balance 56 56
Average Investment 29 32
Recorded Investment 5 6
Principal Balance 6 6
Related Allowance 5 6
Average Investment $ 16 $ 124