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Loans - Summary of Information Regarding Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 40 $ 67
Recorded Investment 11,005 8,041
Unpaid Principal   68
Principal Balance   8,405
Reserve 369 67
Average Investment   59
Average Investment 9,704 3,582
Interest Recognized 774 128
Recorded Investment 11,005 7,974
Principal Balance 11,119 8,337
Average Investment 9,664 3,523
Interest Recognized 774 128
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal   5,840
Recorded Investment 6,277 5,840
Principal Balance 6,277  
Average Investment 6,268 1,824
Interest Recognized 332 87
Commercial Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,492  
Principal Balance 1,492  
Average Investment 503 126
Interest Recognized 40  
Commercial Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 2,804 1,091
Principal Balance 2,804 1,091
Average Investment 2,301 488
Interest Recognized 138 23
Residential real estate and consumer First mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 36 62
Unpaid Principal   62
Reserve   62
Average Investment   43
Recorded Investment 411 1,016
Principal Balance 495 1,350
Average Investment 568 1,056
Interest Recognized 261 18
Residential real estate and consumer Home equity and lines of credit    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 4 5
Unpaid Principal   6
Reserve   5
Average Investment   16
Recorded Investment 21 27
Principal Balance 51 56
Average Investment 24 $ 29
Interest Recognized $ 3