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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | $ 13,305 | $ 14,361 | $ 14,268
Charge-offs | (942) | (1,826) | (2,049)
Recoveries | 771 | 2,070 | 942
Provision (Credit) |  | (1,300) | 1,200
Ending Balance | 13,134 | 13,305 | 14,361
Commercial and Agriculture [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 2,018 | 1,478 | 1,819
Charge-offs | (11) | (880) | (190)
Recoveries | 372 | 105 | 182
Provision (Credit) | (817) | 1,315 | (333)
Ending Balance | 1,562 | 2,018 | 1,478
Commercial Real Estate Owner Occupied [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 2,171 | 2,467 | 2,221
Charge-offs | (328) | (228) | (523)
Recoveries | 69 | 56 | 187
Provision (Credit) | 131 | (124) | 582
Ending Balance | 2,043 | 2,171 | 2,467
Commercial Real Estate Non Owner Occupied [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 4,606 | 4,657 | 4,334
Charge-offs | (38) | (23) | (81)
Recoveries | 46 | 1,372 | 115
Provision (Credit) | 693 | (1,400) | 289
Ending Balance | 5,307 | 4,606 | 4,657
Residential Real Estate [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 3,089 | 4,086 | 3,747
Charge-offs | (400) | (455) | (1,135)
Recoveries | 194 | 479 | 331
Provision (Credit) | (973) | (1,021) | 1,143
Ending Balance | 1,910 | 3,089 | 4,086
Real Estate Construction [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 420 | 371 | 428
Charge-offs |  | (115) |
Recoveries | 44 | 12 | 5
Provision (Credit) | 370 | 152 | (62)
Ending Balance | 834 | 420 | 371
Farm Real Estate [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 442 | 538 | 822
Recoveries | 3 |  | 76
Provision (Credit) | (15) | (96) | (360)
Ending Balance | 430 | 442 | 538
Consumer and Other [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 314 | 382 | 200
Charge-offs | (165) | (125) | (120)
Recoveries | 43 | 46 | 46
Provision (Credit) | 98 | 11 | 256
Ending Balance | 290 | 314 | 382
Unallocated [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 245 | 382 | 697
Provision (Credit) | 513 | (137) | (315)
Ending Balance | $ 758 | $ 245 | $ 382

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