Loans - Allowance for Loan Loss Account by Loan (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 6,289	$ 8,682	$ 8,682
Charge off	(1,744)	(820)	(1,232)
Recovery	182		1,112
General Provision	594		(1,846)
Specific Provision	166		(427)
Ending balance	5,487		6,289
One-to-Four Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,198	2,048	2,048
Charge off	(143)		(233)
Recovery	30		24
General Provision	90		(304)
Specific Provision	(215)		(337)
Ending balance	960		1,198
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	181	218	218
Charge off	(92)		(83)
Recovery	6		3
General Provision	86		(37)
Specific Provision			80
Ending balance	181		181
Junior Liens [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	14	39	39
Recovery	4		9
General Provision	(4)		(25)
Specific Provision	(6)		(9)
Ending balance	8		14
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	85	466	466
General Provision			(381)
Specific Provision	(11)
Ending balance	74		85
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	146	88	88
Charge off			(139)
Recovery			9
General Provision			58
Specific Provision	51		130
Ending balance	197		146
Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,123	1,305	1,305
Charge off	(911)
General Provision	514		(74)
Specific Provision	958		(108)
Ending balance	1,684		1,123
Non-Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,083	2,719	2,719
Charge off	(222)		(66)
Recovery	2		864
General Provision	(375)		(1,368)
Specific Provision	(287)		(66)
Ending balance	1,201		2,083
Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	461	510	510
General Provision			542
Specific Provision	(124)		(591)
Ending balance	337		461
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	494	541	541
Charge off	(224)		(415)
Recovery	94		109
General Provision	120		(13)
Specific Provision	(134)		272
Ending balance	350		494
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	504	$ 748	748
Charge off	(152)		(296)
Recovery	46		94
General Provision	163		(244)
Specific Provision	(66)		202
Ending balance	$ 495		$ 504