Earnings Per Common Share (Computation Of Basic And Diluted Earnings (Loss) Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Earnings Per Common Share [Abstract]
Net income	$ 27,958	$ 25,153	$ 23,277	$ 25,503	$ 21,382	$ 21,862	$ 17,785	$ 13,467	$ 101,891		$ 74,496		$ 28,326
Preferred stock dividends													12,192
Dividends and undistributed earnings allocated to participating securities	183	170	162	167	103	105	86	62	682	[1]	356	[1]	67	[1]
Net earnings available to common shareholders	$ 27,775	$ 24,983	$ 23,115	$ 25,336	$ 21,279	$ 21,757	$ 17,699	$ 13,405	$ 101,209		$ 74,140		$ 16,067
Weighted average number of common shares outstanding - basic									111,935		114,220		107,922
Effect of potentially dilutive common shares									216	[2]	189	[2]	231	[2]
Weighted average number of common shares outstanding - diluted									112,151		114,409		108,153
Basic	$ 0.25	$ 0.22	$ 0.21	$ 0.23	$ 0.19	$ 0.19	$ 0.15	$ 0.12	$ 0.90		$ 0.65		$ 0.15
Diluted	$ 0.25	$ 0.22	$ 0.21	$ 0.23	$ 0.19	$ 0.19	$ 0.15	$ 0.12	$ 0.90		$ 0.65		$ 0.15

[1] Represents dividends paid and undistributed earnings allocated to nonvested restricted stock awards.

[2] Represents the effect of the assumed exercise of warrants, assumed exercise of stock options, vesting of non-participating restricted shares, and vesting of restricted stock units, based on the treasury stock method.