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Loans and Allowance for Loan Losses - Schedule of Loan Portfolio by Reporting Segment and Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2014
FUSB [Member]
Dec. 31, 2013
FUSB [Member]
Dec. 31, 2012
FUSB [Member]
Sep. 30, 2014
ALC [Member]
Dec. 31, 2013
ALC [Member]
Dec. 31, 2012
ALC [Member]
Sep. 30, 2014
Construction, Land Development and Other Land Loans [Member]
Dec. 31, 2013
Construction, Land Development and Other Land Loans [Member]
Sep. 30, 2014
Construction, Land Development and Other Land Loans [Member]
FUSB [Member]
Dec. 31, 2013
Construction, Land Development and Other Land Loans [Member]
FUSB [Member]
Sep. 30, 2014
Secured by 1-4 Family Residential Properties [Member]
Dec. 31, 2013
Secured by 1-4 Family Residential Properties [Member]
Sep. 30, 2014
Secured by 1-4 Family Residential Properties [Member]
FUSB [Member]
Dec. 31, 2013
Secured by 1-4 Family Residential Properties [Member]
FUSB [Member]
Sep. 30, 2014
Secured by 1-4 Family Residential Properties [Member]
ALC [Member]
Dec. 31, 2013
Secured by 1-4 Family Residential Properties [Member]
ALC [Member]
Sep. 30, 2014
Secured by Multi-family Residential Properties [Member]
Dec. 31, 2013
Secured by Multi-family Residential Properties [Member]
Sep. 30, 2014
Secured by Multi-family Residential Properties [Member]
FUSB [Member]
Dec. 31, 2013
Secured by Multi-family Residential Properties [Member]
FUSB [Member]
Sep. 30, 2014
Secured by Non-farm, Non-residential Properties [Member]
Dec. 31, 2013
Secured by Non-farm, Non-residential Properties [Member]
Sep. 30, 2014
Secured by Non-farm, Non-residential Properties [Member]
FUSB [Member]
Dec. 31, 2013
Secured by Non-farm, Non-residential Properties [Member]
FUSB [Member]
Sep. 30, 2014
Other [Member]
Dec. 31, 2013
Other [Member]
Sep. 30, 2014
Other [Member]
FUSB [Member]
Dec. 31, 2013
Other [Member]
FUSB [Member]
Sep. 30, 2014
Commercial and Industrial Loans [Member]
Dec. 31, 2013
Commercial and Industrial Loans [Member]
Sep. 30, 2014
Commercial and Industrial Loans [Member]
FUSB [Member]
Dec. 31, 2013
Commercial and Industrial Loans [Member]
FUSB [Member]
Sep. 30, 2014
Consumer Loans [Member]
Dec. 31, 2013
Consumer Loans [Member]
Sep. 30, 2014
Consumer Loans [Member]
FUSB [Member]
Dec. 31, 2013
Consumer Loans [Member]
FUSB [Member]
Sep. 30, 2014
Consumer Loans [Member]
ALC [Member]
Dec. 31, 2013
Consumer Loans [Member]
ALC [Member]
Sep. 30, 2014
Other Loans [Member]
Dec. 31, 2013
Other Loans [Member]
Sep. 30, 2014
Other Loans [Member]
FUSB [Member]
Dec. 31, 2013
Other Loans [Member]
FUSB [Member]
Dec. 31, 2012
Other Loans [Member]
FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]                                                                                            
Total loans $ 280,226 $ 315,433   $ 200,050 $ 239,874   $ 80,176 $ 75,559   $ 9,813 $ 11,348 $ 9,813 $ 11,348 $ 53,535 $ 61,599 $ 30,867 $ 34,978 $ 22,668 $ 26,621 $ 20,459 $ 22,095 $ 20,459 $ 22,095 $ 112,512 $ 122,430 $ 112,512 $ 122,430 $ 61 $ 761 $ 61 $ 761 $ 18,216 $ 37,772 $ 18,216 $ 37,772 $ 65,227 $ 58,824 $ 7,719 $ 9,886 $ 57,508 $ 48,938 $ 403 $ 604 $ 403 $ 604  
Less: Unearned interest, fees and deferred cost 7,640 5,110   116 149   7,524 4,961                                                                            
Allowance for loan losses 7,416 9,396   4,789 6,272 15,765 2,627 3,124 3,513                                                                       13 66
Net loans $ 265,170 $ 300,927 $ 304,778 $ 195,145 $ 233,453   $ 70,025 $ 67,474