CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amortized Cost of investment securities available for sale at fair value	$ 443,712	$ 377,747
Fair Value of securities held to maturity at amortized cost		59,363
Allowance for loan losses of loans receivable	63,305	89,936
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	62,500,000	62,500,000
Common stock, shares issued	32,074,434	32,066,987
Common stock, shares outstanding	31,496,540	31,489,201
Unrealized gain on securities available for sale and interest only strips, net of income tax	$ 1,946	$ 602
Treasury stock, shares	577,894	577,894