Loans - Non-accrual Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	$ 8,735	$ 10,066	$ 11,812
One-to-Four Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	524	945	1,131
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	29	1	22
Junior Liens [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans		2	37
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans		175
Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	1,217	1,218	2,255
Non-Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	6,520	6,546	7,055
Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	13	703	781
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	1	13	11
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	$ 431	$ 463	$ 520