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Allowance for Loan Losses - Credit Exposures by Internally Assigned Grades (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 813,729 | $ 738,961
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 770,415 | 697,821
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 20,675 | 15,959
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 22,639 | 25,181
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 124,402 | 113,265
Commercial and Agriculture [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 117,739 | 106,989
Commercial and Agriculture [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 3,090 | 3,446
Commercial and Agriculture [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 3,573 | 2,830
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 167,897 | 143,014
Commercial Real Estate Owner Occupied [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 156,622 | 129,849
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 | 5,571 | 4,378
Commercial Real Estate Owner Occupied [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 5,704 | 8,787
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 348,439 | 308,666
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 | 339,734 | 299,167
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 | 6,100 | 5,682
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 | 2,605 | 3,817
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 71,253 | 58,779
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 62,147 | 49,249
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,671 | 697
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 7,435 | 8,833
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 52,644 | 59,644
Real Estate Construction [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 52,399 | 59,584
Real Estate Construction [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 216 | 19
Real Estate Construction [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 29 | 41
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 46,993 | 53,973
Farm Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 39,787 | 51,416
Farm Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 4,024 | 1,737
Farm Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 3,182 | 820
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 2,101 | 1,620
Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,987 | 1,567
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 | $ 111 | $ 53

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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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