CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock	Additional Paid In Capital Preferred Stock	Common Stock	Additional Paid In Capital Common Stock	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net of Tax	Preferred stock, Series A, non-cumulative convertible Additional Paid In Capital Preferred Stock
BALANCE at Dec. 31, 2010	$ 2,113,931	$ 0	$ 83,058	$ 156	$ 1,434,277	$ 720,116	$ (111,262)	$ (12,414)
Increase (Decrease) in Stockholders' Equity
Net income	56,071					56,071
Other comprehensive income	2,259							2,259
Stock compensation costs	2,287				2,287
Tax benefit from stock compensation plans, net	43				43
Issuance of 205,103 and 158,878 shares of common stock pursuant to various stock compensation plans and agreements for the period ended March 31, 2012 and 2011, respectively	1,575				1,575
Conversion of 31 shares of Series A preferred stock into 2,014 shares of common stock					31				(31)
Cancellation of 47,489 and 42,524 shares of common stock due to forfeitures of issued restricted stock for the period ended March 31, 2012 and 2011, respectively					727		(727)
Purchase of 60,073 and 23,676 shares of treasury stock due to the vesting of restricted stock for the period ended March 31, 2012 and 2011, respectively	(548)						(548)
Preferred stock dividends	(1,715)					(1,715)
Common stock dividends	(1,486)					(1,486)
Repurchase of 1,517,555 common stock warrants	(14,500)				(14,500)
BALANCE at Mar. 31, 2011	2,157,917		83,027	156	1,424,440	772,986	(112,537)	(10,155)
BALANCE at Dec. 31, 2011	2,311,743		83,027	157	1,443,883	934,617	(116,001)	(33,940)
Increase (Decrease) in Stockholders' Equity
Net income	68,083					68,083
Other comprehensive income	17,062							17,062
Stock compensation costs	3,637				3,637
Tax benefit from stock compensation plans, net	29				29
Issuance of 205,103 and 158,878 shares of common stock pursuant to various stock compensation plans and agreements for the period ended March 31, 2012 and 2011, respectively	1,539				1,539
Cancellation of 47,489 and 42,524 shares of common stock due to forfeitures of issued restricted stock for the period ended March 31, 2012 and 2011, respectively					883		(883)
Purchase of 60,073 and 23,676 shares of treasury stock due to the vesting of restricted stock for the period ended March 31, 2012 and 2011, respectively	(1,313)						(1,313)
Preferred stock dividends	(1,714)					(1,714)
Common stock dividends	(14,791)					(14,791)
Purchase of 4,554,827 shares of treasury stock pursuant to the Stock Repurchase Program	(100,978)						(100,978)
BALANCE at Mar. 31, 2012	$ 2,283,297	$ 0	$ 83,027	$ 157	$ 1,449,971	$ 986,195	$ (219,175)	$ (16,878)