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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | $ 13,300 | $ 14,433 | $ 13,305 | $ 14,361
Charge-offs | (357) | (230) | (488) | (356)
Recoveries | 104 | 1,644 | 230 | 1,842
Provision |  | (1,300) |  | (1,300)
Ending Balance | 13,047 | 14,547 | 13,047 | 14,547
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,569 | 1,446 | 2,018 | 1,478
Charge-offs |  | (20) | (1) | (42)
Recoveries | 27 | 30 | 83 | 35
Provision | 12 | 101 | (492) | 86
Ending Balance | 1,608 | 1,557 | 1,608 | 1,557
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 4,543 | 4,711 | 4,606 | 4,657
Recoveries | 4 | 1,319 | 9 | 1,359
Provision | 192 | (1,061) | 124 | (1,047)
Ending Balance | 4,739 | 4,969 | 4,739 | 4,969
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 3,022 | 4,114 | 3,089 | 4,086
Charge-offs | (107) | (129) | (196) | (225)
Recoveries | 32 | 272 | 87 | 361
Provision | (271) | (358) | (304) | (323)
Ending Balance | 2,676 | 3,899 | 2,676 | 3,899
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 413 | 408 | 420 | 371
Recoveries | 14 | 1 | 19 | 2
Provision | 55 | (43) | 43 | (7)
Ending Balance | 482 | 366 | 482 | 366
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 407 | 496 | 442 | 538
Provision | 18 | (20) | (17) | (62)
Ending Balance | 425 | 476 | 425 | 476
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 354 | 358 | 314 | 382
Charge-offs | (40) | (39) | (81) | (47)
Recoveries | 11 | 19 | 14 | 33
Provision | (1) | 20 | 77 | (10)
Ending Balance | 324 | 358 | 324 | 358
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,259 | 2,372 | 2,171 | 2,467
Charge-offs | (210) | (42) | (210) | (42)
Recoveries | 16 | 3 | 18 | 52
Provision | (55) | 60 | 31 | (84)
Ending Balance | 2,010 | 2,393 | 2,010 | 2,393
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 733 | 528 | 245 | 382
Provision | 50 | 1 | 538 | 147
Ending Balance | $ 783 | $ 529 | $ 783 | $ 529

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