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Loans and Allowance for Loan Losses - Summary of Accounts Notes Loans and Financing Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans $ 647,572 $ 415,587
Less: Unearned income 738 719
Total 646,834 414,868
Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 77,282 49,076
Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 446 216
Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 39,202 31,979
Grade 1 Prime [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,269 1,966
Grade 1 Prime [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,509  
Grade 1 Prime [Member] | Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans   9
Grade 1 Prime [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 293 213
Grade 2 Desirable [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 12,423 8,940
Grade 2 Desirable [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 924 2,660
Grade 2 Desirable [Member] | Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 118 99
Grade 2 Desirable [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 72 29
Grade 3 Good [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 307,963 208,644
Grade 3 Good [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 35,012 21,009
Grade 3 Good [Member] | Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 168 105
Grade 3 Good [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 17,872 16,174
Grade 4 Acceptable [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 297,590 167,948
Grade 4 Acceptable [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 37,298 24,254
Grade 4 Acceptable [Member] | Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 160 3
Grade 4 Acceptable [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 20,067 15,081
Grade 5 Pass/Watch [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 16,482 19,039
Grade 5 Pass/Watch [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 568 797
Grade 5 Pass/Watch [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 116 123
Grade 6 Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,553 2,190
Grade 6 Special Mention [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,488  
Grade 7 Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 6,292 6,860
Grade 7 Substandard [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 483 312
Grade 7 Substandard [Member] | Consumer Installment Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 782 359
Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 38,039 14,666
Real Estate [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 26,778 15,102
Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 251,824 150,513
Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 208,494 149,856
Real Estate [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 5,507 4,179
Real Estate [Member] | Grade 1 Prime [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,467 1,700
Real Estate [Member] | Grade 2 Desirable [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,454 485
Real Estate [Member] | Grade 2 Desirable [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 139  
Real Estate [Member] | Grade 2 Desirable [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 4,971 1,920
Real Estate [Member] | Grade 2 Desirable [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 4,611 3,647
Real Estate [Member] | Grade 2 Desirable [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 134 100
Real Estate [Member] | Grade 3 Good [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 24,667 7,118
Real Estate [Member] | Grade 3 Good [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 9,355 4,305
Real Estate [Member] | Grade 3 Good [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 118,488 82,097
Real Estate [Member] | Grade 3 Good [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 100,665 76,496
Real Estate [Member] | Grade 3 Good [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,736 1,340
Real Estate [Member] | Grade 4 Acceptable [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 10,850 5,937
Real Estate [Member] | Grade 4 Acceptable [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 14,331 5,059
Real Estate [Member] | Grade 4 Acceptable [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 114,598 53,487
Real Estate [Member] | Grade 4 Acceptable [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 98,116 63,397
Real Estate [Member] | Grade 4 Acceptable [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 2,170 730
Real Estate [Member] | Grade 5 Pass/Watch [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 102 106
Real Estate [Member] | Grade 5 Pass/Watch [Member] | Construction, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 2,953 5,738
Real Estate [Member] | Grade 5 Pass/Watch [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 9,273 8,470
Real Estate [Member] | Grade 5 Pass/Watch [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,470 3,805
Real Estate [Member] | Grade 6 Special Mention [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,935 1,668
Real Estate [Member] | Grade 6 Special Mention [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 130 522
Real Estate [Member] | Grade 7 Substandard [Member] | Construction, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 966 1,020
Real Estate [Member] | Grade 7 Substandard [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 2,559 2,871
Real Estate [Member] | Grade 7 Substandard [Member] | Mortgage, Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans $ 1,502 1,989
Real Estate [Member] | Grade 7 Substandard [Member] | Mortgage, Farmland [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans   $ 309