Loans - Recorded Investment in Past Due and Non-accruing Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	$ 1,171	$ 917
90 Days or More Past Due and Still Accruing	43	19
Nonaccruals	1,742	2,754
Total Past Due and Nonaccruals	2,956	3,690
Current	255,908	246,641
Total Gross Loans	258,864	250,331
Construction, Land and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	64	65
Nonaccruals	847	854
Total Past Due and Nonaccruals	911	919
Current	32,894	30,920
Total Gross Loans	33,805	31,839
Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,174	1,262
Total Gross Loans	1,174	1,262
Commercial Mortgages (Non-Owner Occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruals	413
Total Past Due and Nonaccruals	413
Current	15,304	14,626
Total Gross Loans	15,717	14,626
Commercial Mortgages (Owner Occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruals		427
Total Past Due and Nonaccruals		427
Current	32,234	33,750
Total Gross Loans	32,234	34,177
Residential First Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	954	668
Nonaccruals	236	1,083
Total Past Due and Nonaccruals	1,190	1,751
Current	120,451	112,707
Total Gross Loans	121,641	114,458
Residential Revolving and Junior Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	109	108
Nonaccruals	16	76
Total Past Due and Nonaccruals	125	184
Current	25,691	23,861
Total Gross Loans	25,816	24,045
Commercial and Industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	21	16
Nonaccruals	228	311
Total Past Due and Nonaccruals	249	327
Current	22,429	23,611
Total Gross Loans	22,678	23,938
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	23	60
90 Days or More Past Due and Still Accruing	43	19
Nonaccruals	2	3
Total Past Due and Nonaccruals	68	82
Current	5,731	5,904
Total Gross Loans	$ 5,799	$ 5,986