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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | $ 117 |  |  | $ 263 |  |  |
Collectively evaluated for impairment | 13,237 |  |  | 13,975 |  |  |
Total | 13,451 | $ 14,547 | $ 14,361 | 14,361 | $ 14,760 | $ 14,707 | $ 14,268
Individually evaluated for impairment | 7,214 |  |  | 7,354 |  |  |
Collectively evaluated for impairment | 1,039,487 |  |  | 993,910 |  |  |
Total | 1,046,967 |  |  | 1,001,527 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans acquired with credit deterioration | 97 |  |  | 123 |  |  |
Loan balance of loans acquired with credit deterioration | 266 |  |  | 263 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 23 |  |  |
Collectively evaluated for impairment | 1,710 |  |  | 1,455 |  |  |
Total | 1,710 | 1,557 | 1,478 | 1,478 | 1,378 | 1,395 | 1,819
Individually evaluated for impairment | 2,386 |  |  | 873 |  |  |
Collectively evaluated for impairment | 127,225 |  |  | 123,397 |  |  |
Total | 129,700 |  |  | 124,402 |  |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan balance of loans acquired with credit deterioration | 89 |  |  | 132 |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment | 4,543 |  |  | 4,657 |  |  |
Total | 4,543 | 4,969 | 4,657 | 4,657 | 4,939 | 3,153 | 4,334
Individually evaluated for impairment | 369 |  |  | 1,742 |  |  |
Collectively evaluated for impairment | 385,494 |  |  | 346,697 |  |  |
Total | 385,863 |  |  | 348,439 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | 4 |  |  | 103 |  |  |
Collectively evaluated for impairment | 2,306 |  |  | 2,364 |  |  |
Total | 2,310 | 2,393 | 2,467 | 2,467 | 2,682 | 5,073 | 2,221
Individually evaluated for impairment | 1,939 |  |  | 2,141 |  |  |
Collectively evaluated for impairment | 165,625 |  |  | 165,756 |  |  |
Total | 167,564 |  |  | 167,897 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | 113 |  |  | 137 |  |  |
Collectively evaluated for impairment | 3,245 |  |  | 3,826 |  |  |
Total | 3,455 | 3,899 | 4,086 | 4,086 | 4,222 | 3,470 | 3,747
Individually evaluated for impairment | 1,854 |  |  | 1,642 |  |  |
Collectively evaluated for impairment | 245,143 |  |  | 234,565 |  |  |
Total | 247,174 |  |  | 236,338 |  |  |
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans acquired with credit deterioration | 97 |  |  | 123 |  |  |
Loan balance of loans acquired with credit deterioration | 177 |  |  | 131 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment | 424 |  |  | 371 |  |  |
Total | 424 | 366 | 371 | 371 | 428 | 434 | 428
Collectively evaluated for impairment | 56,919 |  |  | 58,898 |  |  |
Total | 56,919 |  |  | 58,898 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment | 430 |  |  | 538 |  |  |
Total | 430 | 476 | 538 | 538 | 658 | 584 | 822
Individually evaluated for impairment | 665 |  |  | 953 |  |  |
Collectively evaluated for impairment | 41,197 |  |  | 46,040 |  |  |
Total | 41,862 |  |  | 46,993 |  |  |
Consumer and Other [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment | 337 |  |  | 382 |  |  |
Total | 337 | 358 | 382 | 382 | 374 | 190 | 200
Individually evaluated for impairment | 1 |  |  | 3 |  |  |
Collectively evaluated for impairment | 17,884 |  |  | 18,557 |  |  |
Total | 17,885 |  |  | 18,560 |  |  |
Unallocated [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment | 242 |  |  | 382 |  |  |
Total | $ 242 | $ 529 | $ 382 | $ 382 | $ 79 | $ 408 | $ 697

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