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Allowance for Loan Losses - Credit Exposures by Internally Assigned Grades (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 890,541 | $ 854,479
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 852,009 | 816,760
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 21,818 | 17,342
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 16,714 | 20,377
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 143,708 | 135,462
Commercial and Agriculture [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 136,174 | 127,867
Commercial and Agriculture [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 5,245 | 4,300
Commercial and Agriculture [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 2,289 | 3,295
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 172,262 | 161,364
Commercial Real Estate Owner Occupied [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 160,769 | 151,659
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 | 6,233 | 4,016
Commercial Real Estate Owner Occupied [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 5,260 | 5,689
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 405,876 | 395,931
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 | 403,157 | 393,592
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 | 1,916 | 1,676
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 | 803 | 663
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 69,375 | 67,587
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 61,022 | 59,015
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 2,098 | 1,661
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 6,255 | 6,911
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 58,382 | 50,721
Real Estate Construction [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 58,340 | 50,678
Real Estate Construction [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 15 | 16
Real Estate Construction [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 27 | 27
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 39,069 | 41,170
Farm Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 30,753 | 31,814
Farm Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 6,311 | 5,673
Farm Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 2,005 | 3,683
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,869 | 2,244
Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,794 | 2,135
Consumer and Other [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 75 | $ 109

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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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