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Allowance for Loan Losses - Impaired Financing Receivables - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 6,031 | $ 6,328
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 7,222 | 8,463
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,426 | 4,821
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,443 | 5,209
Impaired financing receivables, with an allowance recorded, Related Allowance | 315 | 1,023
Impaired financing receivables, Recorded Investment, Total | 7,457 | 11,149
Impaired financing receivables, Unpaid Principal Balance, Total | 8,665 | 13,672
Impaired financing receivables, Related Allowance, Total | 315 | 1,023
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 871 | 1,377
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,036 | 1,504
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 23 | 927
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 23 | 1,056
Impaired financing receivables, with an allowance recorded, Related Allowance | 16 | 641
Impaired financing receivables, Recorded Investment, Total | 894 | 2,304
Impaired financing receivables, Unpaid Principal Balance, Total | 1,059 | 2,560
Impaired financing receivables, Related Allowance, Total | 16 | 641
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 2,368 | 2,961
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,583 | 3,327
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 258 | 596
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 258 | 643
Impaired financing receivables, with an allowance recorded, Related Allowance | 4 | 57
Impaired financing receivables, Recorded Investment, Total | 2,626 | 3,557
Impaired financing receivables, Unpaid Principal Balance, Total | 2,841 | 3,970
Impaired financing receivables, Related Allowance, Total | 4 | 57
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,828 | 92
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,094 | 140
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment |  | 2,083
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance |  | 2,287
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 20
Impaired financing receivables, Recorded Investment, Total | 1,828 | 2,175
Impaired financing receivables, Unpaid Principal Balance, Total | 2,094 | 2,427
Impaired financing receivables, Related Allowance, Total |  | 20
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 960 | 1,893
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,505 | 3,487
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,145 | 1,215
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,162 | 1,223
Impaired financing receivables, with an allowance recorded, Related Allowance | 295 | 305
Impaired financing receivables, Recorded Investment, Total | 2,105 | 3,108
Impaired financing receivables, Unpaid Principal Balance, Total | 2,667 | 4,710
Impaired financing receivables, Related Allowance, Total | 295 | 305
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 4 | 5
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 4 | 5
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 4 | 5
Impaired financing receivables, Unpaid Principal Balance, Total | $ 4 | $ 5

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- Definition 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 + Details
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