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Allowance for Loans Losses - Summary of Accounts Notes Loans and Financing Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans $ 671,666 $ 647,572
Less: Unearned income (731) (738)
Total 670,935 646,834
Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 82,177 77,282
Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 309 446
Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 42,409 39,202
Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 42,527 38,039
Real Estate [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 27,152 26,778
Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 256,543 251,824
Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 215,155 208,494
Real Estate [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 5,394 5,507
Grade 1 Prime [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,401 3,269
Grade 1 Prime [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,618 1,509
Grade 1 Prime [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 373 293
Grade 1 Prime [Member] | Real Estate [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,410 1,467
Grade 2 Desirable [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 10,510 12,423
Grade 2 Desirable [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,428 924
Grade 2 Desirable [Member] | Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 104 118
Grade 2 Desirable [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 54 72
Grade 2 Desirable [Member] | Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,563 1,454
Grade 2 Desirable [Member] | Real Estate [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans   139
Grade 2 Desirable [Member] | Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,675 4,971
Grade 2 Desirable [Member] | Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,570 4,611
Grade 2 Desirable [Member] | Real Estate [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 116 134
Grade 3 Good [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 317,951 307,963
Grade 3 Good [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 35,586 35,012
Grade 3 Good [Member] | Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 139 168
Grade 3 Good [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 17,627 17,872
Grade 3 Good [Member] | Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 25,044 24,667
Grade 3 Good [Member] | Real Estate [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 9,359 9,355
Grade 3 Good [Member] | Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 125,197 118,488
Grade 3 Good [Member] | Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 103,297 100,665
Grade 3 Good [Member] | Real Estate [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,702 1,736
Grade 4 Acceptable [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 314,119 297,590
Grade 4 Acceptable [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 41,167 37,298
Grade 4 Acceptable [Member] | Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 66 160
Grade 4 Acceptable [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 23,524 20,067
Grade 4 Acceptable [Member] | Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 14,865 10,850
Grade 4 Acceptable [Member] | Real Estate [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 14,174 14,331
Grade 4 Acceptable [Member] | Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 114,441 114,598
Grade 4 Acceptable [Member] | Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 103,716 98,116
Grade 4 Acceptable [Member] | Real Estate [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 2,166 2,170
Grade 5 Pass/Watch [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 16,937 16,482
Grade 5 Pass/Watch [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 926 568
Grade 5 Pass/Watch [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 110 116
Grade 5 Pass/Watch [Member] | Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 102 102
Grade 5 Pass/Watch [Member] | Real Estate [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,619 2,953
Grade 5 Pass/Watch [Member] | Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 9,193 9,273
Grade 5 Pass/Watch [Member] | Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 2,987 3,470
Grade 6 Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 2,576 3,553
Grade 6 Special Mention [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 883 1,488
Grade 6 Special Mention [Member] | Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,444 1,935
Grade 6 Special Mention [Member] | Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 249 130
Grade 7 Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 6,172 6,292
Grade 7 Substandard [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 569 483
Grade 7 Substandard [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 721 782
Grade 7 Substandard [Member] | Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 953 966
Grade 7 Substandard [Member] | Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 2,593 2,559
Grade 7 Substandard [Member] | Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans $ 1,336 $ 1,502