Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest Expense
Threshold limit of time deposits, minimum	$ 100,000	$ 100,000	$ 100,000	$ 100,000