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Allowance for Loan Losses - Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 9,157 | $ 7,258
Current | 996,646 | 994,269
Total Loans | 1,005,803 | 1,001,527
Past Due 90 Days and Accruing | 0 | 0
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,538 | 78
Current | 120,669 | 124,324
Total Loans | 122,207 | 124,402
Past Due 90 Days and Accruing | 0 | 0
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,051 | 1,302
Current | 165,808 | 166,595
Total Loans | 166,859 | 167,897
Past Due 90 Days and Accruing | 0 | 0
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,697 | 722
Current | 343,020 | 347,717
Total Loans | 344,717 | 348,439
Past Due 90 Days and Accruing | 0 | 0
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,272 | 4,974
Current | 239,563 | 231,364
Total Loans | 243,835 | 236,338
Past Due 90 Days and Accruing | 0 | 0
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 8
Current | 64,176 | 58,890
Total Loans | 64,176 | 58,898
Past Due 90 Days and Accruing | 0 | 0
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 525 |
Current | 44,435 | 46,993
Total Loans | 44,960 | 46,993
Past Due 90 Days and Accruing | 0 | 0
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 74 | 174
Current | 18,975 | 18,386
Total Loans | 19,049 | 18,560
Past Due 90 Days and Accruing | 0 | 0
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,970 | 4,211
30-59 Days Past Due [Member] | Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 274 | 9
30-59 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 245 | 982
30-59 Days Past Due [Member] | Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 144 | 269
30-59 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,720 | 2,845
30-59 Days Past Due [Member] | Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 8
30-59 Days Past Due [Member] | Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 525 |
30-59 Days Past Due [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 62 | 98
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,508 | 870
60-89 Days Past Due [Member] | Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 32
60-89 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 216 | 36
60-89 Days Past Due [Member] | Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,213 | 330
60-89 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 70 | 404
60-89 Days Past Due [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9 | 68
90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,679 | 2,177
90 Days or Greater [Member] | Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,264 | 37
90 Days or Greater [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 590 | 284
90 Days or Greater [Member] | Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 340 | 123
90 Days or Greater [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,482 | 1,725
90 Days or Greater [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 3 | $ 8

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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