Deposits (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deposits [Abstract]
Brokered deposits included in jumbo certificates of deposit	$ 0	$ 200,000
Minimum denomination	100,000
Time seposits at minimum denominations of $100,000	290,166,000	394,238,000
jumbo time deposits including brokered		394,400,000
Overdrawn transaction deposit accounts reclassified to loans	400,000	400,000
Interest expense on time deposits of $100,000 or more	$ 5,000,000	$ 6,100,000	$ 8,300,000
Basis points over the prevailing interest rates	0.75%