Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest Expense
Threshold limit of time deposits, minimum	$ 100,000	$ 100,000	$ 100,000	$ 100,000