CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Comprehensive income:
Net unrealized gain on securities available-for-sale, tax expense	$ 14,817	$ 1,233
Reclassification adjustment for net gain included in net income	5,468	11,331
Noncredit-related impairment loss on securities, tax benefits	2,139	3,217
Foreign currency translation adjustments, tax expense (benefits)	$ (482)	$ 134
Shares issued pursuant to various stock plans and agreements (in shares)	353,098	1,096,739
Converted shares of common stock (in shares)	2,014	37,103,734
Shares cancelled due to forfeitures of issued restricted stock (in shares)	122,170	200,806
Shares of treasury stock purchased due to vesting of restricted stock (in shares)	24,834	23,785
Common stock warrants repurchased (in shares)	1,517,555	0
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