Deposits (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Certificates of deposit outstanding
Within one year	$ 535,435
One to two years	110,227
Two to three years	19,575
Three to four years	9,924
Four to five years	9,443
Total	$ 684,604	$ 1,033,798