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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 92 | $ 91 |  |
Allowance for loan losses, Collectively evaluated for impairment | 16,856 | 14,676 |  |
Allowance for loan losses, Total | 16,948 | 14,767 | $ 13,822 | $ 13,679
Outstanding loan balances, Individually evaluated for impairment | 3,193 | 3,597 |  |
Outstanding loan balances, Collectively evaluated for impairment | 1,739,448 | 1,704,906 |  |
Outstanding loan balances, Total | 1,743,125 | 1,708,970 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan balance of loans acquired with credit deterioration | 484 | 467 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,400 | 2,219 |  |
Allowance for loan losses, Total | 2,400 | 2,219 | 1,834 | 1,747
Outstanding loan balances, Individually evaluated for impairment |  | 367 |  |
Outstanding loan balances, Collectively evaluated for impairment | 201,860 | 202,743 |  |
Outstanding loan balances, Total | 201,860 | 203,110 |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 9 | 9 |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,801 | 2,532 |  |
Allowance for loan losses, Total | 2,810 | 2,541 | 1,979 | 1,962
Outstanding loan balances, Individually evaluated for impairment | 415 | 426 |  |
Outstanding loan balances, Collectively evaluated for impairment | 255,218 | 245,180 |  |
Outstanding loan balances, Total | 255,633 | 245,606 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 7,617 | 6,584 |  |
Allowance for loan losses, Total | 7,617 | 6,584 | 5,989 | 5,803
Outstanding loan balances, Individually evaluated for impairment | 371 | 374 |  |
Outstanding loan balances, Collectively evaluated for impairment | 615,821 | 591,848 |  |
Outstanding loan balances, Total | 616,192 | 592,222 |  |
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 83 | 82 |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,867 | 1,500 |  |
Allowance for loan losses, Total | 1,950 | 1,582 | 1,434 | 1,531
Outstanding loan balances, Individually evaluated for impairment | 1,742 | 1,764 |  |
Outstanding loan balances, Collectively evaluated for impairment | 456,252 | 460,801 |  |
Outstanding loan balances, Total | 458,478 | 463,032 |  |
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan balance of loans acquired with credit deterioration | 484 | 467 |  |
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,606 | 1,250 |  |
Allowance for loan losses, Total | 1,606 | 1,250 | 971 | 1,046
Outstanding loan balances, Collectively evaluated for impairment | 163,807 | 155,825 |  |
Outstanding loan balances, Total | 163,807 | 155,825 |  |
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 310 | 344 |  |
Allowance for loan losses, Total | 310 | 344 | 366 | 397
Outstanding loan balances, Individually evaluated for impairment | 665 | 666 |  |
Outstanding loan balances, Collectively evaluated for impairment | 31,487 | 33,448 |  |
Outstanding loan balances, Total | 32,152 | 34,114 |  |
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 246 | 247 |  |
Allowance for loan losses, Total | 246 | 247 | 251 | 284
Outstanding loan balances, Collectively evaluated for impairment | 15,003 | 15,061 |  |
Outstanding loan balances, Total | 15,003 | 15,061 |  |
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 9 | 0 |  |
Allowance for loan losses, Total | $ 9 | $ 0 | $ 998 | $ 909

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