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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 91 | $ 141 |  |
Allowance for loan losses, Collectively evaluated for impairment | 14,676 | 13,530 |  |
Allowance for loan losses, Total | 14,767 | 13,679 | $ 13,134 | $ 13,305
Outstanding loan balances, Individually evaluated for impairment | 3,597 | 2,857 |  |
Outstanding loan balances, Collectively evaluated for impairment | 1,704,906 | 1,558,160 |  |
Outstanding loan balances, Total | 1,708,970 | 1,561,941 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration |  | 8 |  |
Loan balance of loans acquired with credit deterioration | 467 | 924 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,219 | 1,747 |  |
Allowance for loan losses, Total | 2,219 | 1,747 | 1,562 | 2,018
Outstanding loan balances, Individually evaluated for impairment | 367 | 367 |  |
Outstanding loan balances, Collectively evaluated for impairment | 202,743 | 176,693 |  |
Outstanding loan balances, Total | 203,110 | 177,101 |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan balance of loans acquired with credit deterioration |  | 41 |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 9 | 12 |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,532 | 1,950 |  |
Allowance for loan losses, Total | 2,541 | 1,962 | 2,043 | 2,171
Outstanding loan balances, Individually evaluated for impairment | 426 | 484 |  |
Outstanding loan balances, Collectively evaluated for impairment | 245,180 | 209,637 |  |
Outstanding loan balances, Total | 245,606 | 210,121 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 6,584 | 5,803 |  |
Allowance for loan losses, Total | 6,584 | 5,803 | 5,307 | 4,606
Outstanding loan balances, Individually evaluated for impairment | 374 | 31 |  |
Outstanding loan balances, Collectively evaluated for impairment | 591,848 | 523,567 |  |
Outstanding loan balances, Total | 592,222 | 523,598 |  |
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 82 | 122 |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,500 | 1,401 |  |
Allowance for loan losses, Total | 1,582 | 1,531 | 1,910 | 3,089
Outstanding loan balances, Individually evaluated for impairment | 1,764 | 1,279 |  |
Outstanding loan balances, Collectively evaluated for impairment | 460,801 | 455,688 |  |
Outstanding loan balances, Total | 463,032 | 457,850 |  |
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration |  | 8 |  |
Loan balance of loans acquired with credit deterioration | 467 | 883 |  |
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,250 | 1,046 |  |
Allowance for loan losses, Total | 1,250 | 1,046 | 834 | 420
Outstanding loan balances, Collectively evaluated for impairment | 155,825 | 135,195 |  |
Outstanding loan balances, Total | 155,825 | 135,195 |  |
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment |  | 7 |  |
Allowance for loan losses, Collectively evaluated for impairment | 344 | 390 |  |
Allowance for loan losses, Total | 344 | 397 | 430 | 442
Outstanding loan balances, Individually evaluated for impairment | 666 | 696 |  |
Outstanding loan balances, Collectively evaluated for impairment | 33,448 | 37,817 |  |
Outstanding loan balances, Total | 34,114 | 38,513 |  |
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 247 | 284 |  |
Allowance for loan losses, Total | 247 | 284 | 290 | 314
Outstanding loan balances, Collectively evaluated for impairment | 15,061 | 19,563 |  |
Outstanding loan balances, Total | $ 15,061 | 19,563 |  |
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  | 909 |  |
Allowance for loan losses, Total |  | $ 909 | $ 758 | $ 245

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