Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period of nonperforming loans			90 days
Non-accruing loans excluded from impaired loan	$ 325,000		$ 325,000		$ 724,000
Non-accruing loans accrued interest	6,000	9,000	13,000	20,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential properties collateralized with loan			0
Residential First Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance in order to assign a risk rating grade	1,000,000		1,000,000
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance in order to assign a risk rating grade	$ 250,000		$ 250,000