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
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	179,028					179,028
Other comprehensive income	(9,181)							(9,181)
Stock compensation costs	9,330				9,330
Tax benefit from stock compensation plans, net	546				546
Issuance of 299,964 and 597,232 shares of common stock pursuant to various stock compensation plans and agreements for the period ended September 30, 2012 and 2011, respectively	3,663				3,663
Conversion of 31 shares of Series A preferred stock into 2,014 shares of common stock for the period ended September 30, 2011			(31)		31
Issuance of 26,151 and 27,831 shares pursuant to Director retainer fee for the period ended September 30, 2012 and 2011, respectively	520				520
Cancellation of 154,508 and 180,152 shares of common stock due to forfeitures of issued restricted stock for the period ended September 30, 2012 and 2011, respectively					3,073		(3,073)
130,577 and 27,938 shares of restricted stock surrendered due to employee tax liability for the period ended September 30, 2012 and 2011, respectively	(619)						(619)
Preferred stock dividends	(5,143)					(5,143)
Common stock dividends	(16,406)					(16,406)
Repurchase of 1,517,555 common stock warrants for the period ended September 30, 2011	(14,500)				(14,500)
BALANCE at Sep. 30, 2011	2,261,169	0	83,027	156	1,436,940	877,595	(114,954)	(21,595)
BALANCE at Dec. 31, 2011	2,311,743	0	83,027	157	1,443,883	934,617	(116,001)	(33,940)
Increase (Decrease) in Stockholders' Equity
Net income	209,750	0				209,750
Other comprehensive income	32,423							32,423
Stock compensation costs	11,567				11,567
Tax benefit from stock compensation plans, net	461				461
Issuance of 299,964 and 597,232 shares of common stock pursuant to various stock compensation plans and agreements for the period ended September 30, 2012 and 2011, respectively	3,136				3,136
Issuance of 26,151 and 27,831 shares pursuant to Director retainer fee for the period ended September 30, 2012 and 2011, respectively	570				570
Cancellation of 154,508 and 180,152 shares of common stock due to forfeitures of issued restricted stock for the period ended September 30, 2012 and 2011, respectively					2,653		(2,653)
130,577 and 27,938 shares of restricted stock surrendered due to employee tax liability for the period ended September 30, 2012 and 2011, respectively	(2,867)						(2,867)
Preferred stock dividends	(5,142)					(5,142)
Common stock dividends	(43,482)					(43,482)
Purchase of 9,068,105 shares of treasury stock pursuant to the Stock Repurchase Program for the period ended September 30, 2012	(199,950)						(199,950)
BALANCE at Sep. 30, 2012	$ 2,318,209	$ 0	$ 83,027	$ 157	$ 1,462,270	$ 1,095,743	$ (321,471)	$ (1,517)