Loans and Allowance for Loan Losses - Schedule of Aging Analysis of Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 253,015	$ 274,317
Accruing loans past due 90 days or more amounted	1,700	1,700
Real Estate [Member] \| Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	10,137	10,431
Real Estate [Member] \| Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	49,754	52,104
Real Estate [Member] \| Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	18,837	20,403
Real Estate [Member] \| Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	86,982	104,883
Real Estate [Member] \| Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	58	58
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	17,897	16,838
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	68,575	69,021
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	775	579
FUSB [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	350	525
60-89 Days Past Due	18	190
Greater than 90 Days	1,586	2,717
Total Past Due	1,954	3,432
Current	169,531	187,743
Total loans	171,485	191,175
Accruing loans past due 90 days or more amounted	30	11
FUSB [Member] \| Real Estate [Member] \| Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		41
Greater than 90 Days	86	86
Total Past Due	86	127
Current	10,051	10,304
Total loans	10,137	10,431
FUSB [Member] \| Real Estate [Member] \| Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	244	200
60-89 Days Past Due	18	20
Greater than 90 Days	429	852
Total Past Due	691	1,072
Current	28,854	29,723
Total loans	29,545	30,795
Accruing loans past due 90 days or more amounted	30
FUSB [Member] \| Real Estate [Member] \| Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	18,837	20,403
Total loans	18,837	20,403
FUSB [Member] \| Real Estate [Member] \| Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	62	268
60-89 Days Past Due		159
Greater than 90 Days	1,043	1,743
Total Past Due	1,105	2,170
Current	85,877	102,713
Total loans	86,982	104,883
FUSB [Member] \| Real Estate [Member] \| Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	58	58
Total loans	58	58
FUSB [Member] \| Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	28
60-89 Days Past Due		8
Total Past Due	28	8
Current	17,869	16,830
Total loans	17,897	16,838
FUSB [Member] \| Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	16	12
60-89 Days Past Due		3
Greater than 90 Days	17	24
Total Past Due	33	39
Current	7,221	7,149
Total loans	7,254	7,188
FUSB [Member] \| Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		4
Greater than 90 Days	11	12
Total Past Due	11	16
Current	764	563
Total loans	775	579
Accruing loans past due 90 days or more amounted		11
ALC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	854	853
60-89 Days Past Due	705	705
Greater than 90 Days	1,762	1,847
Total Past Due	3,321	3,405
Current	78,209	79,737
Total loans	81,530	83,142
Accruing loans past due 90 days or more amounted	1,663	1,736
ALC [Member] \| Real Estate [Member] \| Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	182
60-89 Days Past Due	147
Greater than 90 Days	524
Total Past Due	853
Current	19,356
Total loans	20,209	21,309
Accruing loans past due 90 days or more amounted	426
ALC [Member] \| Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	672
60-89 Days Past Due	558
Greater than 90 Days	1,238
Total Past Due	2,468
Current	58,853
Total loans	61,321	61,833
Accruing loans past due 90 days or more amounted	1,237
ALC [Member] \| Residential Real Estate Portfolio \| Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		182
60-89 Days Past Due		147
Greater than 90 Days		501
Total Past Due		830
Current		20,480
Total loans		21,310
Accruing loans past due 90 days or more amounted		401
ALC [Member] \| Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		671
60-89 Days Past Due		558
Greater than 90 Days		1,346
Total Past Due		2,575
Current		59,257
Total loans		61,832
Accruing loans past due 90 days or more amounted		$ 1,335

Loans and Allowance for Loan Losses - Schedule of Aging Analysis of Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Financing Receivable, Recorded Investment, Past Due [Line Items]

Total loans

$ 253,015

$ 274,317

Accruing loans past due 90 days or more amounted

1,700

Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]

Financing Receivable, Recorded Investment, Past Due [Line Items]

Total loans