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Allowance for Loan Losses - Impaired Financing Receivables - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 8,665 | $ 14,056 | $ 9,849 | $ 16,362
Impaired financing receivables, Interest Income Recognized, Total | 109 | 116 | 381 | 563
Commercial and Agriculture [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,058 | 2,829 | 1,680 | 3,570
Impaired financing receivables, Interest Income Recognized, Total | 9 | 25 | 54 | 104
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 3,263 | 5,115 | 3,507 | 6,313
Impaired financing receivables, Interest Income Recognized, Total | 39 | 21 | 168 | 208
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,870 | 2,770 | 1,997 | 2,913
Impaired financing receivables, Interest Income Recognized, Total | 12 | (4) | 31 | 31
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 2,450 | 3,336 | 2,640 | 3,559
Impaired financing receivables, Interest Income Recognized, Total | 49 | 74 | 128 | 220
Real Estate Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 20 |  | 20 |
Consumer and Other [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 4 | $ 6 | $ 5 | $ 7

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 + Details
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