Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (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 Dec. 31, 2010	$ 1,013,198	$ 3	$ 747	$ 556,001	$ 461,503	$ (5,056)
Net Income	31,211	0	0	0	31,211	0
Other comprehensive loss	(19,672)	0	0	0	0	(19,672)
Issuance of common stock	1,093	0	4	1,089	0	0
Repurchase of common stock	(2,313)	0	(1)	(2,312)	0	0
Share-based grants (including income tax benefits)	4,281	0	0	4,281	0	0
Cash dividends on preferred stock	(113)	0	0	0	(113)	0
Paid-in-kind dividends on Series B Preferred Stock	0	0	0	591	(591)	0
Balance at Jun. 30, 2011	1,027,685	3	750	559,650	492,010	(24,728)
Balance at Dec. 31, 2011	967,665	3	751	561,247	513,413	(107,749)
Net Income	23,018	0	0	0	23,018	0
Other comprehensive loss	(5,345)	0	0	0	0	(5,345)
Conversion of preferred stock	0	(3)	188	(185)	0	0
Issuance of common stock	198,762	0	226	198,536	0	0
Repurchase of common stock	(360)	0	0	(360)	0	0
Share-based grants (including income tax benefits)	3,184	0	0	3,184	0	0
Cash dividends on preferred stock	(5,555)	0	0	0	(5,555)	0
Balance at Jun. 30, 2012	$ 1,181,369	$ 0	$ 1,165	$ 762,422	$ 530,876	$ (113,094)