Time Deposits (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Time Deposits (Textual) [Abstract]
Aggregate amount of time deposits in denominations of $100 thousand or more	$ 107,623,000	$ 161,700,000
Interest expense on time deposits over $100 thousand	$ 1,400,000	$ 2,000,000