CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Comprehensive income:
Net unrealized gain on securities available-for-sale, tax expense	$ 3,913	$ 6,057
Reclassification adjustment for net gain included in net income	10,925	8,363
Noncredit-related impairment loss on securities, tax benefits	2,139	2,366
Foreign currency translation adjustments, tax expense (benefits)	424	480
Net unrealized loss on other asset investment, taxes benefits	$ 174
Shares issued pursuant to various stock plans and agreements (in shares)	597,232	1,216,392
Converted shares of common stock (in shares)	2,014	37,103,734
Issuance of shares pursuant to Director retainer fee (in shares)	27,831	17,910
Shares cancelled due to forfeitures of issued restricted stock (in shares)	180,152	293,105
Shares of treasury stock purchased due to vesting of restricted stock (in shares)	27,938	26,182
Common stock warrants repurchased (in shares)	1,517,555
Series A Preferred Stock [Member]
Comprehensive income:
Shares of preferred stock converted (in shares)	31
Series C Preferred Stock [Member]
Comprehensive income:
Shares of preferred stock converted (in shares)		335,047