Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Loans by Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Ending balance	$ 268,577	$ 274,317
FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	175,213	191,175
FUSB [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	165,175	160,421
FUSB [Member] | Special Mention 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	5,025	15,385
FUSB [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	5,013	15,369
ALC [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	93,364	83,142
ALC [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Ending balance	91,707	81,237
ALC [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Ending balance	1,657	1,905
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	11,827	10,431
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	47,963	52,104
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	11,845	20,403
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	83,883	104,883
Real Estate [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	115	58
Real Estate [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	11,827	10,431
Real Estate [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	9,862	5,326
Real Estate [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member] | Special Mention 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance		2,515
Real Estate [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	1,965	2,590
Real Estate [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	30,730	30,795
Real Estate [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	29,252	27,956
Real Estate [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member] | Special Mention 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	228	638
Real Estate [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	1,250	2,201
Real Estate [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	11,845	20,403
Real Estate [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	11,845	18,033
Real Estate [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance		2,370
Real Estate [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	83,883	104,883
Real Estate [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	78,647	86,812
Real Estate [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member] | Special Mention 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	4,315	10,905
Real Estate [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	921	7,166
Real Estate [Member] | FUSB [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	115	58
Real Estate [Member] | FUSB [Member] | Other Real Estate Loans [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	115	58
Real Estate [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	17,233	21,309
Real Estate [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Ending balance	16,964	20,778
Real Estate [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Ending balance	269	531
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	29,377	16,838
Commercial and Industrial Loans [Member] | FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	29,377	16,838
Commercial and Industrial Loans [Member] | FUSB [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	28,170	14,915
Commercial and Industrial Loans [Member] | FUSB [Member] | Special Mention 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	482	1,222
Commercial and Industrial Loans [Member] | FUSB [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	725	701
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	83,188	69,021
Consumer Loans [Member] | FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	7,057	7,188
Consumer Loans [Member] | FUSB [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	6,905	6,744
Consumer Loans [Member] | FUSB [Member] | Special Mention 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance		105
Consumer Loans [Member] | FUSB [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	152	339
Consumer Loans [Member] | ALC [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	76,131	61,833
Consumer Loans [Member] | ALC [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Ending balance	74,743	60,459
Consumer Loans [Member] | ALC [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Ending balance	1,388	1,374
Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	379	579
Other Loans [Member] | FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	379	579
Other Loans [Member] | FUSB [Member] | Pass 1-5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	$ 379	577
Other Loans [Member] | FUSB [Member] | Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance		$ 2