Loans Net - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in loans	$ 1,382,000
Allowance for loan losses	156,000
Troubled Debt Restructuring
Financing Receivable, Recorded Investment [Line Items]
Loan considered for troubled debt restructuring	15
Extended Term of Loan
Financing Receivable, Recorded Investment [Line Items]
Loan Modified	5
Financing Receivable Troubled Debt Restructurings Interest Rate Reductions
Financing Receivable, Recorded Investment [Line Items]
Loan Modified	6
Previously Restructured
Financing Receivable, Recorded Investment [Line Items]
Loan considered for troubled debt restructuring	27
Previously Restructured | Defaulted in the Quarter
Financing Receivable, Recorded Investment [Line Items]
Loan considered for troubled debt restructuring	4
Previously Restructured | Defaulted during the previous 12 months
Financing Receivable, Recorded Investment [Line Items]
Loan considered for troubled debt restructuring	13
Classified Loan
Financing Receivable, Recorded Investment [Line Items]
Loans rated as Special Mention	23,900,000
Pass Credit
Financing Receivable, Recorded Investment [Line Items]
Percentage of loan portfolio considered pass credits	75.00%
Grade 6 Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans rated as Special Mention	$ 12,300,000