CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net unrealized gain (loss) on investment securities available-for-sale, taxes (benefits)	$ (13,007)	$ (4,028)	$ 52,749
Reclassification for net gain (loss) included in net income	(12,084)	5,714	(63,730)
Unrealized gain as a result of desecuritization, taxes			22,124
Noncredit-related impairment loss on securities, taxes (benefits)	(2,143)	(6,492)	(5,935)
Foreign currency translation adjustments, taxes (benefits)	$ (438)	$ 1,098
Issuance of common stock from various private placements, shares			23,247,012
Issuance of common stock from public offering, shares			12,650,000
Issuance of shares pursuant to various stock compensation plans and agreements, shares	1,024,925	1,867,194	488,256
Issuance of shares pursuant to Director retainer fee, shares	27,831	17,910	22,386
Cancellation of common stock due to forfeitures of issued restricted stock, shares	240,193	343,029	76,962
Purchase of treasury stock purchased due to vesting of restricted stock, shares	29,610	65,834	37,020
Repurchase of common stock warrants and preferred stock, shares	1,517,555
Preferred stock, Series A, non-cumulative convertible
Converted shares of common stock, shares	2,014		9,968,760
Shares of preferred stock converted, shares	31		110,764
Preferred stock, Series B, cumulative
Repurchase of common stock warrants and preferred stock, shares		306,546
Preferred stock, Series C, cumulative convertible
Converted shares of common stock, shares		37,103,734
Shares of preferred stock converted, shares		335,047
Issuance of shares, stock issuance costs, shares			335,047