Loans Receivable, Credit Quality for Loans and the Allowance for Loan Losses - Summary of Aging of Loans Receivable by Loan Portfolio Segments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 6,354	$ 5,888
Current	392,139	403,957
Ending balance	398,493	409,845
Recorded Investment Greater Than 90 Days & Accruing	349	89
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	142	494
Current	18,767	16,943
Ending balance	18,909	17,437
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	957	1,041
Current	45,373	45,035
Ending balance	46,330	46,076
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,232	24
Current	102,398	110,431
Ending balance	104,630	110,455
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	666	889
Current	76,196	68,758
Ending balance	76,862	69,647
Commercial Real Estate 1-4 Family Investment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	736	396
Current	24,493	25,002
Ending balance	25,229	25,398
Recorded Investment Greater Than 90 Days & Accruing	30
Commercial Land and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	218	250
Current	8,948	18,349
Ending balance	9,166	18,599
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,402	2,783
Current	111,112	114,886
Ending balance	112,514	117,669
Recorded Investment Greater Than 90 Days & Accruing	319	89
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1	11
Current	4,852	4,553
Ending balance	4,853	4,564
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,455	1,556
30-59 Days Past Due [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	112	46
30-59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	741	34
30-59 Days Past Due [Member] | Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,232
30-59 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	381	172
30-59 Days Past Due [Member] | Commercial Real Estate 1-4 Family Investment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	130	131
30-59 Days Past Due [Member] | Commercial Land and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	218
30-59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	640	1,163
30-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1	10
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	801	2,134
60-89 Days Past Due [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	30	412
60-89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1
60-89 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		447
60-89 Days Past Due [Member] | Commercial Real Estate 1-4 Family Investment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	576
60-89 Days Past Due [Member] | Commercial Land and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		250
60-89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	194	1,025
90 Days and Greater [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,098	2,198
90 Days and Greater [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		36
90 Days and Greater [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	215	1,007
90 Days and Greater [Member] | Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		24
90 Days and Greater [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	285	270
90 Days and Greater [Member] | Commercial Real Estate 1-4 Family Investment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	30	265
90 Days and Greater [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 568	595
90 Days and Greater [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 1