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Loans - Summary of Information Regarding Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Recorded Investment   $ 40
Recorded Investment $ 6,227 11,005
Reserve 0 369
Average Investment 8,758 9,704
Interest Recognized 337 774
Recorded Investment 6,227 11,005
Principal Balance 6,498 11,119
Average Investment 8,758 9,664
Interest Recognized 337 774
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 4,088 6,277
Principal Balance 4,089 6,277
Average Investment 5,615 6,268
Interest Recognized 213 332
Commercial Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment   1,492
Principal Balance   1,492
Average Investment 734 503
Interest Recognized 33 40
Commercial Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 745 2,804
Principal Balance 796 2,804
Average Investment 1,478 2,301
Interest Recognized 35 138
Residential real estate and consumer First mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment   36
Recorded Investment 1,357 411
Principal Balance 1,572 495
Average Investment 914 568
Interest Recognized 34 261
Residential real estate and consumer Home equity and lines of credit    
Financing Receivable, Impaired [Line Items]    
Recorded Investment   4
Recorded Investment 37 21
Principal Balance 41 51
Average Investment 17 24
Interest Recognized $ 22 $ 3