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Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Loans by Credit Quality Indicator (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Ending balance $ 280,226 $ 315,433
Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 9,813 11,348
Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 53,535 61,599
Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 20,459 22,095
Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 112,512 122,430
Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 61 761
Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 18,216 37,772
Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 65,227 58,824
Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 403 604
FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 200,050 239,874
FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 9,813 11,348
FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 30,867 34,978
FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 20,459 22,095
FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 112,512 122,430
FUSB [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 61 761
FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 18,216 37,772
FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 7,719 9,886
FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 403 604
ALC [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 80,176 75,559
ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 22,668 26,621
ALC [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 57,508 48,938
Pass 1-5 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 156,138 192,281
Pass 1-5 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 4,782 4,785
Pass 1-5 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 27,741 30,459
Pass 1-5 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 14,249 14,569
Pass 1-5 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 86,422 101,468
Pass 1-5 [Member] | FUSB [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 61 761
Pass 1-5 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 15,231 30,403
Pass 1-5 [Member] | FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 7,251 9,235
Pass 1-5 [Member] | FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 401 601
Special Mention 6 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 27,357 4,588
Special Mention 6 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,623  
Special Mention 6 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 725 333
Special Mention 6 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 3,436  
Special Mention 6 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 18,534 3,316
Special Mention 6 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,014 936
Special Mention 6 [Member] | FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 25 3
Substandard 7 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 16,555 42,930
Substandard 7 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,408 6,563
Substandard 7 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,401 4,162
Substandard 7 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,774 7,526
Substandard 7 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 7,556 17,595
Substandard 7 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 971 6,433
Substandard 7 [Member] | FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 443 648
Substandard 7 [Member] | FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2 3
Doubtful 8 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance   75
Doubtful 8 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance   24
Doubtful 8 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance   51
Performing [Member] | ALC [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 78,499 73,705
Performing [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 22,101 26,061
Performing [Member] | ALC [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 56,398 47,644
Nonperforming [Member] | ALC [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 1,677 1,854
Nonperforming [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 567 560
Nonperforming [Member] | ALC [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance $ 1,110 $ 1,294