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Loans and Allowance for Loan Losses - Schedule of Average Net Investment Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | $ 17,562 | $ 14,743
Interest Income Recognized | 395 | 552
Interest Income Received | 377 | 540
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 3,081 | 2,769
Interest Income Recognized | 20 | 46
Interest Income Received | 22 | 46
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 193 | 143
Interest Income Recognized |  | 3
Interest Income Received |  | 3
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 4,997 | 3,565
Interest Income Recognized | 72 | 178
Interest Income Received | 63 | 170
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 9,138 | 8,186
Interest Income Recognized | 289 | 324
Interest Income Received | 279 | 320
Commercial and Industrial Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 153 | 80
Interest Income Recognized | 14 | 1
Interest Income Received | $ 13 | $ 1

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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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