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Loans and Allowance for Loan Losses - Schedule of Number of Loans Modified Troubled Debt Restructuring by Loan Portfolio (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) SecurityLoan | Dec. 31, 2014 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 13 | 18
Pre-Modification Outstanding Principal Balance | $ 3,590 | $ 5,089
Post-Modification Principal Balance | $ 2,600 | $ 3,929
Subsequent default number of loans | SecurityLoan | 2 | 2
Recorded Investment | $ 603 | $ 886
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 3 | 4
Pre-Modification Outstanding Principal Balance | $ 2,220 | $ 3,282
Post-Modification Principal Balance | $ 1,699 | $ 2,365
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 4 | 4
Pre-Modification Outstanding Principal Balance | $ 200 | $ 200
Post-Modification Principal Balance | $ 148 | $ 156
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 4 | 6
Pre-Modification Outstanding Principal Balance | $ 1,054 | $ 1,448
Post-Modification Principal Balance | $ 658 | $ 1,299
Subsequent default number of loans | SecurityLoan | 2 | 2
Recorded Investment | $ 603 | $ 886
Commercial and Industrial Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 2 | 4
Pre-Modification Outstanding Principal Balance | $ 116 | $ 159
Post-Modification Principal Balance | $ 95 | $ 109

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524 + Details
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