Loans - Performing and Nonperforming Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	$ 597,995	$ 664,051
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	170,429	232,276
Commercial real estate: Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	18,545	16,863
Commercial real estate: Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	289,360	286,403
Residential: 1-4 family [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	70,691	78,557
Residential: Home equities [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	45,462	45,181
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	3,508	4,771
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	568,199	625,478
Performing [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	163,902	229,341
Performing [Member] | Commercial real estate: Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	18,545	16,863
Performing [Member] | Commercial real estate: Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	274,821	262,395
Performing [Member] | Residential: 1-4 family [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	62,474	66,927
Performing [Member] | Residential: Home equities [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	44,949	45,181
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	3,508	4,771
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	29,796	38,573
Nonperforming [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	6,527	2,935
Nonperforming [Member] | Commercial real estate: Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	0	0
Nonperforming [Member] | Commercial real estate: Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	14,539	24,008
Nonperforming [Member] | Residential: 1-4 family [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	8,217	11,630
Nonperforming [Member] | Residential: Home equities [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	513	0
Nonperforming [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross portfolio loans	$ 0	$ 0