Loans - Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	$ 7,158	$ 3,175	$ 1,117
One-to-Four Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	1,427	1,501	407
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	48		31
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	1,968	95
Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	1,680	215	301
Non-Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	672	1,159	101
Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	168	115	12
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans			2
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	$ 1,195	$ 90	$ 263