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Loans and Allowance for Loan Losses - Schedule of Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | $ 251,800 | $ 274,317
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 11,900 | 10,431
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 50,042 | 52,104
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 13,005 | 20,403
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 75,840 | 104,883
Real Estate [Member] | Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 116 | 58
Commercial and Industrial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 18,796 | 16,838
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 81,615 | 69,021
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 486 | 579
FUSB [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,164 | 3,432
Current | 155,876 | 187,743
Total loans | 159,040 | 191,175
Accruing loans past due 90 days or more amounted |  | 11
FUSB [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 761 | 525
FUSB [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,095 | 190
FUSB [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,308 | 2,717
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 86 | 127
Current | 11,814 | 10,304
Total loans | 11,900 | 10,431
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 41
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 86 | 86
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 799 | 1,072
Current | 31,250 | 29,723
Total loans | 32,049 | 30,795
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 156 | 200
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 250 | 20
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 393 | 852
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 841 |
Current | 12,164 | 20,403
Total loans | 13,005 | 20,403
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 841 |
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,292 | 2,170
Current | 74,548 | 102,713
Total loans | 75,840 | 104,883
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 524 | 268
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 159
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 768 | 1,743
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 116 | 58
Total loans | 116 | 58
FUSB [Member] | Commercial and Industrial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 52 | 8
Current | 18,744 | 16,830
Total loans | 18,796 | 16,838
FUSB [Member] | Commercial and Industrial Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 52 |
FUSB [Member] | Commercial and Industrial Loans [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 8
FUSB [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 94 | 39
Current | 6,754 | 7,149
Total loans | 6,848 | 7,188
FUSB [Member] | Consumer Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 29 | 12
FUSB [Member] | Consumer Loans [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4 | 3
FUSB [Member] | Consumer Loans [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 61 | 24
FUSB [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 16
Current | 486 | 563
Total loans | 486 | 579
Accruing loans past due 90 days or more amounted |  | 11
FUSB [Member] | Other Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 4
FUSB [Member] | Other Loans [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 12
ALC [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,121 | 3,405
Current | 89,639 | 79,737
Total loans | 92,760 | 83,142
Accruing loans past due 90 days or more amounted |  | 1,736
ALC [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,005 | 853
ALC [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 551 | 705
ALC [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,565 | 1,847
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 490 | 830
Current | 17,503 | 20,479
Total loans | 17,993 | 21,309
Accruing loans past due 90 days or more amounted |  | 401
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 117 | 182
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 53 | 147
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 320 | 501
ALC [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,631 | 2,575
Current | 72,136 | 59,258
Total loans | 74,767 | 61,833
Accruing loans past due 90 days or more amounted |  | 1,335
ALC [Member] | Consumer Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 888 | 671
ALC [Member] | Consumer Loans [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 498 | 558
ALC [Member] | Consumer Loans [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1,245 | $ 1,346

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