Recorded Investment in Nonperforming Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	$ 4,749	$ 5,259
Loans 90+ Days Past Due Still Accruing	173	227
Total Nonperforming Loans	5,302	6,848
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,123	1,533
Loans 90+ Days Past Due Still Accruing	147	180
Total Nonperforming Loans	4,118	4,691
Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	118	120
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	159	283
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	0	0
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,424	1,456
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	109	780
Commercial Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,898	1,898
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	189	189
Home Equity and Second Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	186	252
Loans 90+ Days Past Due Still Accruing	26	39
Total Nonperforming Loans	536	567
Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	8
Total Nonperforming Loans	191	338
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	4,922	5,486
Nonperforming Financing Receivable | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	1,270	1,713
Nonperforming Financing Receivable | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	118	120
Nonperforming Financing Receivable | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	0	0
Nonperforming Financing Receivable | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	1,424	1,456
Nonperforming Financing Receivable | Commercial Business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	1,898	1,898
Nonperforming Financing Receivable | Home Equity and Second Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	212	291
Nonperforming Financing Receivable | Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonperforming Loans	$ 0	$ 8