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Loans and Allowance for Loan Losses - Schedule of Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | $ 260,133 | $ 274,317
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 12,363 | 10,431
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 49,693 | 52,104
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 17,163 | 20,403
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 81,621 | 104,883
Real Estate [Member] | Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 57 | 58
Commercial and Industrial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 18,198 | 16,838
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 80,252 | 69,021
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 786 | 579
FUSB [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,053 | 3,432
Current | 165,609 | 187,743
Total loans | 167,662 | 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 | 248 | 525
FUSB [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 552 | 190
FUSB [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,253 | 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 | 516 | 127
Current | 11,847 | 10,304
Total loans | 12,363 | 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] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 430 |
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 | 659 | 1,072
Current | 29,905 | 29,723
Total loans | 30,564 | 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 | 151 | 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 | 103 | 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 | 405 | 852
FUSB [Member] | Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 17,163 | 20,403
Total loans | 17,163 | 20,403
FUSB [Member] | Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 762 | 2,170
Current | 80,859 | 102,713
Total loans | 81,621 | 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 |  | 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 | 762 | 1,743
FUSB [Member] | Real Estate [Member] | Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 57 | 58
Total loans | 57 | 58
FUSB [Member] | Commercial and Industrial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 52 | 8
Current | 18,146 | 16,830
Total loans | 18,198 | 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 | 64 | 39
Current | 6,846 | 7,149
Total loans | 6,910 | 7,188
FUSB [Member] | Consumer Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 45 | 12
FUSB [Member] | Consumer Loans [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 19 | 3
FUSB [Member] | Consumer Loans [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 24
FUSB [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 16
Current | 786 | 563
Total loans | 786 | 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 | 2,836 | 3,405
Current | 89,635 | 79,737
Total loans | 92,471 | 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 | 671 | 853
ALC [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 413 | 705
ALC [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,752 | 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 | 546 |
Current | 18,583 |
Total loans | 19,129 | 21,309
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 | 34 |
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 | 40 |
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 | 472 |
ALC [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,290 | 2,575
Current | 71,052 | 59,258
Total loans | 73,342 | 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 | 637 | 671
ALC [Member] | Consumer Loans [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 373 | 558
ALC [Member] | Consumer Loans [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1,280 | 1,346
ALC [Member] | Residential Real Estate Portfolio | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 830
Current |  | 20,479
Total loans |  | 21,309
Accruing loans past due 90 days or more amounted |  | 401
ALC [Member] | Residential Real Estate Portfolio | 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 |  | 182
ALC [Member] | Residential Real Estate Portfolio | 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 |  | 147
ALC [Member] | Residential Real Estate Portfolio | Secured by 1-4 Family Residential Properties [Member] | 90 Days Or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | $ 501

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