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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
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Ending balance $ 286,690 $ 315,433
Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 10,223 11,348
Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 55,764 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 119,574 122,430
Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 72 761
Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 17,385 37,772
Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 62,237 58,824
Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 976 604
FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 208,756 239,874
FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 10,223 11,348
FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 31,596 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 119,574 122,430
FUSB [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 72 761
FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 17,385 37,772
FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 8,471 9,886
FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 976 604
ALC [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 77,934 75,559
ALC [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 24,168 26,621
ALC [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
ALC [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
ALC [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
ALC [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
ALC [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 53,766 48,938
ALC [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Pass 1-5 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 172,091 192,281
Pass 1-5 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 4,685 4,785
Pass 1-5 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 28,293 30,459
Pass 1-5 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 14,696 14,569
Pass 1-5 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 100,011 101,468
Pass 1-5 [Member] | FUSB [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 72 761
Pass 1-5 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 15,423 30,403
Pass 1-5 [Member] | FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 7,935 9,235
Pass 1-5 [Member] | FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 976 601
Special Mention 6 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 19,652 4,588
Special Mention 6 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,625  
Special Mention 6 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 757 333
Special Mention 6 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 3,451  
Special Mention 6 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 11,406 3,316
Special Mention 6 [Member] | FUSB [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Special Mention 6 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 1,392 936
Special Mention 6 [Member] | FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 21 3
Special Mention 6 [Member] | FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Substandard 7 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 17,013 42,930
Substandard 7 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,913 6,563
Substandard 7 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,546 4,162
Substandard 7 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,312 7,526
Substandard 7 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 8,157 17,595
Substandard 7 [Member] | FUSB [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Substandard 7 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 570 6,433
Substandard 7 [Member] | FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 515 648
Substandard 7 [Member] | FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0 3
Doubtful 8 [Member] | FUSB [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0 75
Doubtful 8 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Doubtful 8 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0 24
Doubtful 8 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Doubtful 8 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0 51
Doubtful 8 [Member] | FUSB [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Doubtful 8 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Doubtful 8 [Member] | FUSB [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Doubtful 8 [Member] | FUSB [Member] | Other Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 0  
Performing [Member] | ALC [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 76,160 73,705
Performing [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 23,431 26,061
Performing [Member] | ALC [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 52,729 47,644
Nonperforming [Member] | ALC [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 1,774 1,854
Nonperforming [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 737 560
Nonperforming [Member] | ALC [Member] | Consumer Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Ending balance $ 1,037 $ 1,294