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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | $ 13,047 | $ 14,547 | $ 13,305 | $ 14,361
Charge-offs | (309) | (1,183) | (797) | (1,539)
Recoveries | 208 | 87 | 438 | 1,929
Provision |  |  |  | (1,300)
Ending Balance | 12,946 | 13,451 | 12,946 | 13,451
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,608 | 1,557 | 2,018 | 1,478
Charge-offs | (10) | (828) | (11) | (870)
Recoveries | 51 | 44 | 134 | 79
Provision | (38) | 937 | (530) | 1,023
Ending Balance | 1,611 | 1,710 | 1,611 | 1,710
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,010 | 2,393 | 2,171 | 2,467
Charge-offs | (91) | (124) | (301) | (166)
Recoveries | 8 | 1 | 26 | 53
Provision | 146 | 40 | 177 | (44)
Ending Balance | 2,073 | 2,310 | 2,073 | 2,310
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 4,739 | 4,969 | 4,606 | 4,657
Charge-offs | (38) | (23) | (38) | (23)
Recoveries | 33 | 6 | 42 | 1,365
Provision | 539 | (409) | 663 | (1,456)
Ending Balance | 5,273 | 4,543 | 5,273 | 4,543
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,676 | 3,899 | 3,089 | 4,086
Charge-offs | (116) | (55) | (312) | (280)
Recoveries | 77 | 23 | 164 | 384
Provision | (158) | (412) | (462) | (735)
Ending Balance | 2,479 | 3,455 | 2,479 | 3,455
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 482 | 366 | 420 | 371
Charge-offs |  | (115) |  | (115)
Recoveries | 13 | 6 | 32 | 8
Provision | 172 | 167 | 215 | 160
Ending Balance | 667 | 424 | 667 | 424
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 425 | 476 | 442 | 538
Recoveries | 2 |  | 2 |
Provision | (3) | (46) | (20) | (108)
Ending Balance | 424 | 430 | 424 | 430
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 324 | 358 | 314 | 382
Charge-offs | (54) | (38) | (135) | (85)
Recoveries | 24 | 7 | 38 | 40
Provision | 31 | 10 | 108 | 0
Ending Balance | 325 | 337 | 325 | 337
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 783 | 529 | 245 | 382
Provision | (689) | (287) | (151) | (140)
Ending Balance | $ 94 | $ 242 | $ 94 | $ 242

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