Loans Receivable - Additional Information (Detail) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2014 Office	Jun. 30, 2013 Office	Dec. 31, 2012 Office	Dec. 31, 2013
Receivables [Abstract]
Number of offices of company	23	23	23
Historical loss calculation period	3 years
Allowance for loan losses	$ 6,816,000			$ 6,805,000
Borrowers sustained repayment period	6 months
Non-performing loans, including non-accrual loans and TDRs	8,724,000			8,637,000
Troubled debt restructuring (TDRs)	186,000			368,000
TDR with modified terms	$ 9,300,000			$ 8,200,000
Maturity period of impaired loans	90 days
Maturity period of Larger commercial loans	60 days
Description of Loans	Loans are considered nonaccrual upon reaching 90 days delinquent