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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | $ 12,814 | $ 13,300 | $ 13,134 | $ 13,305
Charge-offs | (226) | (357) | (651) | (488)
Recoveries | 279 | 104 | 384 | 230
Ending Balance | 12,867 | 13,047 | 12,867 | 13,047
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,359 | 1,569 | 1,562 | 2,018
Charge-offs | (123) |  | (248) | (1)
Recoveries | 85 | 27 | 104 | 83
Provision | 309 | 12 | 212 | (492)
Ending Balance | 1,630 | 1,608 | 1,630 | 1,608
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,030 | 2,259 | 2,043 | 2,171
Charge-offs |  | (210) | (193) | (210)
Recoveries | 121 | 16 | 130 | 18
Provision | 10 | (55) | 181 | 31
Ending Balance | 2,161 | 2,010 | 2,161 | 2,010
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 5,670 | 4,543 | 5,307 | 4,606
Charge-offs | (1) |  | (45) |
Recoveries | 7 | 4 | 21 | 9
Provision | (541) | 192 | (148) | 124
Ending Balance | 5,135 | 4,739 | 5,135 | 4,739
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,750 | 3,022 | 1,910 | 3,089
Charge-offs | (40) | (107) | (62) | (196)
Recoveries | 35 | 32 | 93 | 87
Provision | (54) | (271) | (250) | (304)
Ending Balance | 1,691 | 2,676 | 1,691 | 2,676
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 820 | 413 | 834 | 420
Recoveries |  | 14 |  | 19
Provision | 41 | 55 | 27 | 43
Ending Balance | 861 | 482 | 861 | 482
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 411 | 407 | 430 | 442
Recoveries | 2 |  | 3 |
Provision | (3) | 18 | (23) | (17)
Ending Balance | 410 | 425 | 410 | 425
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 247 | 354 | 290 | 314
Charge-offs | (62) | (40) | (103) | (81)
Recoveries | 29 | 11 | 33 | 14
Provision | 86 | (1) | 80 | 77
Ending Balance | 300 | 324 | 300 | 324
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 527 | 733 | 758 | 245
Provision | 152 | 50 | (79) | 538
Ending Balance | $ 679 | $ 783 | $ 679 | $ 783

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