Loans Receivable, Net - Loans by Classification Type and Credit Risk Indicator (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 663,737	$ 642,371
Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	26,067	37,445
One-to-Four Family Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	175,638	163,565
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32,781	35,697
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	38,700	30,246
Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	12,175	14,873
Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	242,390	224,952
Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	34,041	36,851
Junior Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,037	1,184
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	8,442	8,620
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	92,466	88,938
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	645,243	625,893
Pass [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	26,067	37,445
Pass [Member] | One-to-Four Family Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	174,973	162,993
Pass [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32,684	35,285
Pass [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	38,548	30,246
Pass [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	12,175	14,318
Pass [Member] | Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	232,289	216,901
Pass [Member] | Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	33,808	35,253
Pass [Member] | Junior Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,033	1,184
Pass [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	8,233	8,376
Pass [Member] | Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	85,433	83,892
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,171	5,698
Special Mention [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	152
Special Mention [Member] | Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	596	979
Special Mention [Member] | Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	233	1,147
Special Mention [Member] | Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	3,190	3,572
Impaired Loans Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	14,323	10,780
Impaired Loans Substandard [Member] | One-to-Four Family Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	665	572
Impaired Loans Substandard [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	97	412
Impaired Loans Substandard [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		555
Impaired Loans Substandard [Member] | Non-Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	9,505	7,072
Impaired Loans Substandard [Member] | Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		451
Impaired Loans Substandard [Member] | Junior Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4
Impaired Loans Substandard [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	209	244
Impaired Loans Substandard [Member] | Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 3,843	$ 1,474