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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | $ 12,867 | $ 13,047 | $ 13,134 | $ 13,305
Charge-offs | (133) | (309) | (784) | (797)
Recoveries | 207 | 208 | 591 | 438
Provision | 390 |  | 390 |
Ending Balance | 13,331 | 12,946 | 13,331 | 12,946
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,630 | 1,608 | 1,562 | 2,018
Charge-offs |  | (10) | (248) | (11)
Recoveries | 64 | 51 | 168 | 134
Provision | (63) | (38) | 149 | (530)
Ending Balance | 1,631 | 1,611 | 1,631 | 1,611
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,161 | 2,010 | 2,043 | 2,171
Charge-offs |  | (91) | (193) | (301)
Recoveries | 18 | 8 | 148 | 26
Provision | (136) | 146 | 45 | 177
Ending Balance | 2,043 | 2,073 | 2,043 | 2,073
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 5,135 | 4,739 | 5,307 | 4,606
Charge-offs | (76) | (38) | (121) | (38)
Recoveries | 2 | 33 | 23 | 42
Provision | 384 | 539 | 236 | 663
Ending Balance | 5,445 | 5,273 | 5,445 | 5,273
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,691 | 2,676 | 1,910 | 3,089
Charge-offs | (12) | (116) | (74) | (312)
Recoveries | 88 | 77 | 181 | 164
Provision | 32 | (158) | (218) | (462)
Ending Balance | 1,799 | 2,479 | 1,799 | 2,479
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 861 | 482 | 834 | 420
Recoveries |  | 13 |  | 32
Provision | 120 | 172 | 147 | 215
Ending Balance | 981 | 667 | 981 | 667
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 410 | 425 | 430 | 442
Recoveries | 1 | 2 | 4 | 2
Provision | (18) | (3) | (41) | (20)
Ending Balance | 393 | 424 | 393 | 424
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 300 | 324 | 290 | 314
Charge-offs | (45) | (54) | (148) | (135)
Recoveries | 34 | 24 | 67 | 38
Provision | 26 | 31 | 106 | 108
Ending Balance | 315 | 325 | 315 | 325
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 679 | 783 | 758 | 245
Provision | 45 | (689) | (34) | (151)
Ending Balance | $ 724 | $ 94 | $ 724 | $ 94

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