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Loans and Allowance for Loan Losses - Schedule of Loan Portfolio by Reporting Segment and Portfolio Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | $ 251,800 | $ 274,317 |  |
Less: Unearned interest, fees and deferred cost | 9,740 | 8,633 |  |
Allowance for loan losses | 4,345 | 6,168 |  |
Net loans | 237,715 | 259,516 | $ 265,170 |
FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 159,040 | 191,175 |  |
Less: Unearned interest, fees and deferred cost | 164 | 189 |  |
Allowance for loan losses | 1,941 | 3,486 |  | $ 6,272
Net loans | 156,935 | 187,500 |  |
ALC [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 92,760 | 83,142 |  |
Less: Unearned interest, fees and deferred cost | 9,576 | 8,444 |  |
Allowance for loan losses | 2,404 | 2,682 |  | 3,124
Net loans | 80,780 | 72,016 |  |
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 11,900 | 10,431 |  |
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 11,900 | 10,431 |  |
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 50,042 | 52,104 |  |
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 32,049 | 30,795 |  |
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | ALC [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 17,993 | 21,309 |  |
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 13,005 | 20,403 |  |
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 13,005 | 20,403 |  |
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 75,840 | 104,883 |  |
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 75,840 | 104,883 |  |
Real Estate [Member] | Other Real Estate Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 116 | 58 |  |
Real Estate [Member] | Other Real Estate Loans [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 116 | 58 |  |
Commercial and Industrial Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 18,796 | 16,838 |  |
Commercial and Industrial Loans [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 18,796 | 16,838 |  |
Allowance for loan losses | 135 | 141 |  | 592
Consumer Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 81,615 | 69,021 |  |
Consumer Loans [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 6,848 | 7,188 |  |
Allowance for loan losses | 37 | 114 |  | 180
Consumer Loans [Member] | ALC [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 74,767 | 61,833 |  |
Allowance for loan losses | 2,143 | 2,336 |  | 2,667
Other Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 486 | 579 |  |
Other Loans [Member] | FUSB [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 486 | $ 579 |  |
Allowance for loan losses | $ 15 |  |  | $ 13

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