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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
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | $ 14,433 | $ 14,315 | $ 14,361 | $ 14,268
Charge-offs | (230) | (305) | (356) | (890)
Recoveries | 1,644 | 297 | 1,842 | 529
Provision | (1,300) | 400 | (1,300) | 800
Ending Balance | 14,547 | 14,707 | 14,547 | 14,707
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,446 | 1,795 | 1,478 | 1,819
Charge-offs | (20) |  | (42) |
Recoveries | 30 | 12 | 35 | 31
Provision | 101 | (412) | 86 | (455)
Ending Balance | 1,557 | 1,395 | 1,557 | 1,395
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 4,711 | 4,926 | 4,657 | 4,334
Charge-offs |  | (55) |  | (64)
Recoveries | 1,319 | 76 | 1,359 | 90
Provision | (1,061) | (1,794) | (1,047) | (1,207)
Ending Balance | 4,969 | 3,153 | 4,969 | 3,153
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 4,114 | 3,666 | 4,086 | 3,747
Charge-offs | (129) | (213) | (225) | (541)
Recoveries | 272 | 34 | 361 | 165
Provision | (358) | (17) | (323) | 99
Ending Balance | 3,899 | 3,470 | 3,899 | 3,470
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 408 | 498 | 371 | 428
Recoveries | 1 | 2 | 2 | 3
Provision | (43) | (66) | (7) | 3
Ending Balance | 366 | 434 | 366 | 434
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 496 | 799 | 538 | 822
Recoveries |  |  |  | 51
Provision | (20) | (215) | (62) | (289)
Ending Balance | 476 | 584 | 476 | 584
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 358 | 190 | 382 | 200
Charge-offs | (39) | (37) | (47) | (87)
Recoveries | 19 | 16 | 33 | 30
Provision | 20 | 21 | (10) | 47
Ending Balance | 358 | 190 | 358 | 190
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,372 | 1,808 | 2,467 | 2,221
Charge-offs | (42) |  | (42) | (198)
Recoveries | 3 | 157 | 52 | 159
Provision | 60 | 3,108 | (84) | 2,891
Ending Balance | 2,393 | 5,073 | 2,393 | 5,073
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 528 | 633 | 382 | 697
Provision | 1 | (225) | 147 | (289)
Ending Balance | $ 529 | $ 408 | $ 529 | $ 408

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