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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, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | $ 16,018 | $ 42,501
Interest Income Recognized | 428 | 1,573
Interest Income Received | 423 | 1,601
Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 3,010 | 10,249
Interest Income Recognized | 33 | 177
Interest Income Received | 35 | 179
Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 159 | 303
Interest Income Recognized | 3 | 7
Interest Income Received | 3 | 7
Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 3,875 | 8,690
Interest Income Recognized | 131 | 438
Interest Income Received | 128 | 446
Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 8,867 | 22,272
Interest Income Recognized | 260 | 918
Interest Income Received | 256 | 935
Commercial and Industrial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 107 | 987
Interest Income Recognized | 1 | 33
Interest Income Received | $ 1 | $ 34

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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=35738203&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=35738203&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=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting 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)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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