Loans - Loans by Classification Type and Related Allowance Amounts (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 567,511	$ 545,839
Allowance for Performing Loans	4,942	4,775
One-to-Four Family Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	146,370	150,551
Allowance for Performing Loans	931	1,147
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32,976	34,238
Allowance for Performing Loans	181	181
Junior Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,798	2,102
Allowance for Performing Loans	8	14
Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	23,366	25,991
Allowance for Performing Loans	74	85
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32,669	24,241
Allowance for Performing Loans	197	146
Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	22,654	26,654
Allowance for Performing Loans	1,417	460
Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	157,114	150,596
Allowance for Performing Loans	1,058	1,345
Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	40,639	42,874
Allowance for Performing Loans	337	461
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	18,375	14,438
Allowance for Performing Loans	300	432
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	91,550	74,154
Allowance for Performing Loans	439	504
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	537,618	498,609
Pass [Member] | One-to-Four Family Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	143,121	146,129
Pass [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32,703	33,481
Pass [Member] | Junior Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,746	2,025
Pass [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	20,272	20,066
Pass [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32,669	24,241
Pass [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	11,604	15,328
Pass [Member] | Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	147,938	131,854
Pass [Member] | Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	40,309	40,121
Pass [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	18,171	14,118
Pass [Member] | Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	89,085	71,246
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	6,410	9,863
Special Mention [Member] | One-to-Four Family Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	330	203
Special Mention [Member] | Junior Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	36	40
Special Mention [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		2,904
Special Mention [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,529	362
Special Mention [Member] | Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,158	5,492
Special Mention [Member] | Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		516
Special Mention [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		21
Special Mention [Member] | Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	357	325
Impaired Loans Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	23,483	37,367
Impaired Loans Substandard [Member] | One-to-Four Family Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,919	4,219
Impaired Loans Substandard [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	273	757
Impaired Loans Substandard [Member] | Junior Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	16	37
Impaired Loans Substandard [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	3,094	3,021
Impaired Loans Substandard [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	9,521	10,964
Impaired Loans Substandard [Member] | Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	5,018	13,250
Impaired Loans Substandard [Member] | Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	330	2,237
Impaired Loans Substandard [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	204	299
Impaired Loans Substandard [Member] | Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 2,108	$ 2,583