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Loans and Allowance for Loan Losses - Schedule of Loan Portfolio by Reporting Segment and Portfolio Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 251,800	$ 274,317
Less: Unearned interest, fees and deferred cost	9,740	8,633
Allowance for loan losses	4,345	6,168
Net loans	237,715	259,516	$ 265,170
FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	159,040	191,175
Less: Unearned interest, fees and deferred cost	164	189
Allowance for loan losses	1,941	3,486		$ 6,272
Net loans	156,935	187,500
ALC [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	92,760	83,142
Less: Unearned interest, fees and deferred cost	9,576	8,444
Allowance for loan losses	2,404	2,682		3,124
Net loans	80,780	72,016
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,900	10,431
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,900	10,431
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	50,042	52,104
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	32,049	30,795
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | ALC [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	17,993	21,309
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,005	20,403
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,005	20,403
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	75,840	104,883
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	75,840	104,883
Real Estate [Member] | Other Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	116	58
Real Estate [Member] | Other Real Estate Loans [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	116	58
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	18,796	16,838
Commercial and Industrial Loans [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	18,796	16,838
Allowance for loan losses	135	141		592
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	81,615	69,021
Consumer Loans [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,848	7,188
Allowance for loan losses	37	114		180
Consumer Loans [Member] | ALC [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	74,767	61,833
Allowance for loan losses	2,143	2,336		2,667
Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	486	579
Other Loans [Member] | FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	486	$ 579
Allowance for loan losses	$ 15			$ 13

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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