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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment | $ 188 | $ 263 |  |
Collectively evaluated for impairment | 12,942 | 13,975 |  |
Total | 13,305 | 14,361 | $ 14,268 | $ 16,528
Individually evaluated for impairment | 6,539 | 7,354 |  |
Collectively evaluated for impairment | 1,048,711 | 993,910 |  |
Total | 1,055,506 | 1,001,527 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 175 | 123 |  |
Loan balance of loans acquired with credit deterioration | 256 | 263 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment | 82 | 23 |  |
Collectively evaluated for impairment | 1,850 | 1,455 |  |
Total | 2,018 | 1,478 | 1,819 | 2,838
Individually evaluated for impairment | 1,983 | 873 |  |
Collectively evaluated for impairment | 133,391 | 123,397 |  |
Total | 135,462 | 124,402 |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 86 |  |  |
Loan balance of loans acquired with credit deterioration | 88 | 132 |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment | 4 | 103 |  |
Collectively evaluated for impairment | 2,167 | 2,364 |  |
Total | 2,171 | 2,467 | 2,221 | 2,931
Individually evaluated for impairment | 1,896 | 2,141 |  |
Collectively evaluated for impairment | 159,468 | 165,756 |  |
Total | 161,364 | 167,897 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 4,606 | 4,657 |  |
Total | 4,606 | 4,657 | 4,334 | 3,888
Individually evaluated for impairment | 359 | 1,742 |  |
Collectively evaluated for impairment | 395,572 | 346,697 |  |
Total | 395,931 | 348,439 |  |
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment | 102 | 137 |  |
Collectively evaluated for impairment | 2,898 | 3,826 |  |
Total | 3,089 | 4,086 | 3,747 | 5,224
Individually evaluated for impairment | 1,686 | 1,642 |  |
Collectively evaluated for impairment | 245,454 | 234,565 |  |
Total | 247,308 | 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 | 89 | 123 |  |
Loan balance of loans acquired with credit deterioration | 168 | 131 |  |
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 420 | 371 |  |
Total | 420 | 371 | 428 | 184
Collectively evaluated for impairment | 56,293 | 58,898 |  |
Total | 56,293 | 58,898 |  |
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 442 | 538 |  |
Total | 442 | 538 | 822 | 740
Individually evaluated for impairment | 614 | 953 |  |
Collectively evaluated for impairment | 40,556 | 46,040 |  |
Total | 41,170 | 46,993 |  |
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 314 | 382 |  |
Total | 314 | 382 | 200 | 217
Individually evaluated for impairment | 1 | 3 |  |
Collectively evaluated for impairment | 17,977 | 18,557 |  |
Total | 17,978 | 18,560 |  |
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 245 | 382 |  |
Total | $ 245 | $ 382 | $ 697 | $ 506

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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