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Allowance for Loan Losses - Credit Exposures by Internally Assigned Grades (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 854,479 | $ 813,729
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 816,760 | 770,415
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 17,342 | 20,675
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 20,377 | 22,639
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 135,462 | 124,402
Commercial and Agriculture [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 127,867 | 117,739
Commercial and Agriculture [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 4,300 | 3,090
Commercial and Agriculture [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 3,295 | 3,573
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 161,364 | 167,897
Commercial Real Estate Owner Occupied [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 151,659 | 156,622
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 4,016 | 5,571
Commercial Real Estate Owner Occupied [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 5,689 | 5,704
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 395,931 | 348,439
Commercial Real Estate Non Owner Occupied [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 393,592 | 339,734
Commercial Real Estate Non Owner Occupied [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,676 | 6,100
Commercial Real Estate Non Owner Occupied [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 663 | 2,605
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 67,587 | 71,253
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 59,015 | 62,147
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,661 | 1,671
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 6,911 | 7,435
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 50,721 | 52,644
Real Estate Construction [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 50,678 | 52,399
Real Estate Construction [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 16 | 216
Real Estate Construction [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 27 | 29
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 41,170 | 46,993
Farm Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 31,814 | 39,787
Farm Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 5,673 | 4,024
Farm Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 3,683 | 3,182
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 2,244 | 2,101
Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 2,135 | 1,987
Consumer and Other [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade |  | 3
Consumer and Other [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 109 | $ 111

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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