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Allowance for Loan Losses - Changes in the Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | $ 14,547 | $ 14,707 | $ 14,361 | $ 14,361 | $ 14,268
Charge-offs | (1,183) | (634) | (1,539) |  | (1,524)
Recoveries | 87 | 287 | 1,929 |  | 816
Provision |  | 400 | (1,300) | (1,300) | 1,200
Ending Balance | 13,451 | 14,760 | 13,451 | 13,451 | 14,760
Commercial and Agriculture [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 1,557 | 1,395 | 1,478 | 1,478 | 1,819
Charge-offs | (828) | (187) | (870) |  | (187)
Recoveries | 44 | 127 | 79 |  | 158
Provision | 937 | 43 | 1,023 |  | (412)
Ending Balance | 1,710 | 1,378 | 1,710 | 1,710 | 1,378
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 4,969 | 3,153 | 4,657 | 4,657 | 4,334
Charge-offs | (23) | (17) | (23) |  | (81)
Recoveries | 6 | 15 | 1,365 |  | 105
Provision | (409) | 1,788 | (1,456) |  | 581
Ending Balance | 4,543 | 4,939 | 4,543 | 4,543 | 4,939
Residential Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 3,899 | 3,470 | 4,086 | 4,086 | 3,747
Charge-offs | (55) | (238) | (280) |  | (779)
Recoveries | 23 | 124 | 384 |  | 289
Provision | (412) | 866 | (735) |  | 965
Ending Balance | 3,455 | 4,222 | 3,455 | 3,455 | 4,222
Real Estate Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 366 | 434 | 371 | 371 | 428
Charge-offs | (115) |  | (115) |  |
Recoveries | 6 | 1 | 8 |  | 4
Provision | 167 | (7) | 160 |  | (4)
Ending Balance | 424 | 428 | 424 | 424 | 428
Farm Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 476 | 584 | 538 | 538 | 822
Recoveries |  | 9 |  |  | 60
Provision | (46) | 65 | (108) |  | (224)
Ending Balance | 430 | 658 | 430 | 430 | 658
Consumer and Other [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 358 | 190 | 382 | 382 | 200
Charge-offs | (38) | (28) | (85) |  | (115)
Recoveries | 7 | 8 | 40 |  | 38
Provision | 10 | 204 |  |  | 251
Ending Balance | 337 | 374 | 337 | 337 | 374
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 2,393 | 5,073 | 2,467 | 2,467 | 2,221
Charge-offs | (124) | (164) | (166) |  | (362)
Recoveries | 1 | 3 | 53 |  | 162
Provision | 40 | (2,230) | (44) |  | 661
Ending Balance | 2,310 | 2,682 | 2,310 | 2,310 | 2,682
Unallocated [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | 529 | 408 | 382 | 382 | 697
Provision | (287) | (329) | (140) |  | (618)
Ending Balance | $ 242 | $ 79 | $ 242 | $ 242 | $ 79

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