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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment | $ 190 | $ 263 |  |
Collectively evaluated for impairment | 14,130 | 13,975 |  |
Total | 14,433 | 14,361 | $ 14,315 | $ 14,268
Individually evaluated for impairment | 9,419 | 7,354 |  |
Collectively evaluated for impairment | 996,060 | 993,910 |  |
Total | 1,005,803 | 1,001,527 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 113 | 123 |  |
Loan balance of loans acquired with credit deterioration | 324 | 263 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment |  | 23 |  |
Collectively evaluated for impairment | 1,446 | 1,455 |  |
Total | 1,446 | 1,478 | 1,795 | 1,819
Individually evaluated for impairment | 2,521 | 873 |  |
Collectively evaluated for impairment | 119,555 | 123,397 |  |
Total | 122,207 | 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 | 131 | 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 | 2,368 | 2,364 |  |
Total | 2,372 | 2,467 | 1,808 | 2,221
Individually evaluated for impairment | 1,650 | 2,141 |  |
Collectively evaluated for impairment | 165,209 | 165,756 |  |
Total | 166,859 | 167,897 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment | 23 |  |  |
Collectively evaluated for impairment | 4,688 | 4,657 |  |
Total | 4,711 | 4,657 | 4,926 | 4,334
Individually evaluated for impairment | 1,982 | 1,742 |  |
Collectively evaluated for impairment | 342,735 | 346,697 |  |
Total | 344,717 | 348,439 |  |
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Individually evaluated for impairment | 163 | 137 |  |
Collectively evaluated for impairment | 3,838 | 3,826 |  |
Total | 4,114 | 4,086 | 3,666 | 3,747
Individually evaluated for impairment | 1,865 | 1,642 |  |
Collectively evaluated for impairment | 241,777 | 234,565 |  |
Total | 243,835 | 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 | 113 | 123 |  |
Loan balance of loans acquired with credit deterioration | 193 | 131 |  |
Real Estate Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 408 | 371 |  |
Total | 408 | 371 | 498 | 428
Collectively evaluated for impairment | 64,176 | 58,898 |  |
Total | 64,176 | 58,898 |  |
Farm Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 496 | 538 |  |
Total | 496 | 538 | 799 | 822
Individually evaluated for impairment | 1,398 | 953 |  |
Collectively evaluated for impairment | 43,562 | 46,040 |  |
Total | 44,960 | 46,993 |  |
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 358 | 382 |  |
Total | 358 | 382 | 190 | 200
Individually evaluated for impairment | 3 | 3 |  |
Collectively evaluated for impairment | 19,046 | 18,557 |  |
Total | 19,049 | 18,560 |  |
Unallocated [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Collectively evaluated for impairment | 528 | 382 |  |
Total | $ 528 | $ 382 | $ 633 | $ 697

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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=49124121&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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