Recorded Investment in Loans by Risk Category (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	$ 294,478	$ 286,236
Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	279,249	266,540
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	4,066	4,041
Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	5,904	8,072
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	5,259	7,583
Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Residential
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	107,508	108,603
Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	103,594	102,618
Residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	756	958
Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	1,625	2,657
Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	1,533	2,370
Residential | Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Land
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	10,360	9,657
Land | Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	7,096	7,220
Land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	17
Land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	3,144	2,295
Land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	120	125
Land | Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	9,018	11,763
Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	9,018	11,244
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	116
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	403
Construction | Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	76,666	68,902
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	71,893	63,095
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	2,627	1,018
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	690	1,953
Commercial Real Estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	1,456	2,836
Commercial Real Estate | Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Commercial Business
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	22,003	18,655
Commercial Business | Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	19,328	15,026
Commercial Business | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	458	1,354
Commercial Business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	319	499
Commercial Business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	1,898	1,776
Commercial Business | Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Home Equity and Second Mortgage
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	35,269	37,286
Home Equity and Second Mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	34,693	36,035
Home Equity and Second Mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	198	553
Home Equity and Second Mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	126	625
Home Equity and Second Mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	252	73
Home Equity and Second Mortgage | Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Other Consumer
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	33,654	31,370
Other Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	33,627	31,302
Other Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	27	25
Other Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	43
Other Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	0	0
Other Consumer | Unlikely to be Collected Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	$ 0	$ 0