CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at beginning of period at Dec. 31, 2010		$ 425,009	$ 2,130	$ 319,459	$ 293,643	$ 17,718
Total stockholders' equity	986,847	430,498	2,130	319,528	220,764	13,927
Restricted stock grants
Net income (loss)	(67,390)				(67,390)
Other comprehensive income (loss), net of tax	(3,791)					(3,791)
Common stock sold
Accretion of preferred stock discount	(5,489)	5,489			(5,489)
Stock-based compensation				69
Balance at end of period at Sep. 30, 2011	986,847	430,498	2,130	319,528	220,764	13,927
Balance at beginning of period at Dec. 31, 2011	1,444,144	63,047	20,513	884,002	457,384	19,198
Total stockholders' equity	1,484,117	63,047	20,618	885,329	472,631	42,492
Restricted stock grants			76	(76)
Net income (loss)	15,247				15,247
Other comprehensive income (loss), net of tax	23,293					23,294
Common stock sold			29	1,008
Stock-based compensation				395
Balance at end of period at Sep. 30, 2012	1,484,117	63,047	20,618	885,329	472,631	42,492
Balance at beginning of period at Jun. 30, 2012
Total stockholders' equity	1,484,117	63,047
Net income (loss)	19,073
Other comprehensive income (loss), net of tax	15,881
Balance at end of period at Sep. 30, 2012	$ 1,484,117	$ 63,047