Loans - Allowance for Loan Loss Account by Loan (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 5,700	$ 5,700	$ 6,289	$ 6,289
Charge off	(449)	(449)	(1,357)	(1,867)
Recovery	350			227
General Provision	992			295
Specific Provision	(69)			756
Ending balance	6,524	6,524		5,700
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	227	227	85	85
General Provision	63			4
Specific Provision	(137)			138
Ending balance	153	153		227
One-to-Four Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,030	1,030	1,198	1,198
Charge off				(143)
Recovery	161			39
General Provision	149			(176)
Specific Provision	(15)			112
Ending balance	1,325	1,325		1,030
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	201	201	181	181
Charge off	(19)			(92)
Recovery	8			10
General Provision	105			20
Specific Provision	11			82
Ending balance	306	306		201
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	377	377	146	146
General Provision	369			231
Ending balance	746	746		377
Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,379	1,379	1,123	1,123
Charge off				(911)
General Provision	(214)			850
Specific Provision	(69)			317
Ending balance	1,096	1,096		1,379
Non-Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,139	1,139	2,083	2,083
Charge off				(222)
Recovery	3			2
General Provision	53			(944)
Specific Provision	(31)			220
Ending balance	1,164	1,164		1,139
Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	358	358	461	461
General Provision	219			500
Specific Provision				(603)
Ending balance	577	577		358
Junior Liens [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	8	8	14	14
Recovery	5			4
General Provision	2			(6)
Specific Provision	(5)			(4)
Ending balance	10	10		8
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	358	358	494	494
Charge off	(178)			(298)
Recovery	81			118
General Provision	(196)			(123)
Specific Provision	98			167
Ending balance	163	163		358
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	623	623	$ 504	504
Charge off	(252)			(201)
Recovery	92			54
General Provision	442			(61)
Specific Provision	79			327
Ending balance	$ 984	$ 984		$ 623