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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 107 |  | $ 141 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 13,679 |  | 13,530 |  |  |
Allowance for loan losses, Total | 13,786 | $ 13,822 | 13,679 | $ 12,867 | $ 12,814 | $ 13,134
Outstanding loan balances, Individually evaluated for impairment | 3,013 |  | 2,857 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 1,595,169 |  | 1,558,160 |  |  |
Outstanding loan balances, Total | 1,598,770 |  | 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 | 588 |  | 924 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,828 |  | 1,747 |  |  |
Allowance for loan losses, Total | 1,828 | 1,834 | 1,747 | 1,630 | 1,359 | 1,562
Outstanding loan balances, Individually evaluated for impairment | 367 |  | 367 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 186,027 |  | 176,693 |  |  |
Outstanding loan balances, Total | 186,423 |  | 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 | 29 |  | 41 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 10 |  | 12 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,999 |  | 1,950 |  |  |
Allowance for loan losses, Total | 2,009 | 1,979 | 1,962 | 2,161 | 2,030 | 2,043
Outstanding loan balances, Individually evaluated for impairment | 459 |  | 484 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 217,724 |  | 209,637 |  |  |
Outstanding loan balances, Total | 218,183 |  | 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 | 5,867 |  | 5,803 |  |  |
Allowance for loan losses, Total | 5,867 | 5,989 | 5,803 | 5,135 | 5,670 | 5,307
Outstanding loan balances, Individually evaluated for impairment | 379 |  | 31 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 530,191 |  | 523,567 |  |  |
Outstanding loan balances, Total | 530,570 |  | 523,598 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 97 |  | 122 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,601 |  | 1,401 |  |  |
Allowance for loan losses, Total | 1,698 | 1,434 | 1,531 | 1,691 | 1,750 | 1,910
Outstanding loan balances, Individually evaluated for impairment | 1,126 |  | 1,279 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 464,896 |  | 455,688 |  |  |
Outstanding loan balances, Total | 466,581 |  | 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 | 559 |  | 883 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,135 |  | 1,046 |  |  |
Allowance for loan losses, Total | 1,135 | 971 | 1,046 | 861 | 820 | 834
Outstanding loan balances, Collectively evaluated for impairment | 144,448 |  | 135,195 |  |  |
Outstanding loan balances, Total | 144,448 |  | 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 | 365 |  | 390 |  |  |
Allowance for loan losses, Total | 365 | 366 | 397 | 410 | 411 | 430
Outstanding loan balances, Individually evaluated for impairment | 682 |  | 696 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 35,434 |  | 37,817 |  |  |
Outstanding loan balances, Total | 36,116 |  | 38,513 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 201 |  | 284 |  |  |
Allowance for loan losses, Total | 201 | 251 | 284 | 300 | 247 | 290
Outstanding loan balances, Collectively evaluated for impairment | 16,449 |  | 19,563 |  |  |
Outstanding loan balances, Total | 16,449 |  | 19,563 |  |  |
Unallocated [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 683 |  | 909 |  |  |
Allowance for loan losses, Total | $ 683 | $ 998 | $ 909 | $ 679 | $ 527 | $ 758

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