Summary Of Quarterly Financial Information (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract]
Total interest income	$ 57,209		$ 59,469		$ 62,114		$ 69,712		$ 74,919		$ 68,432		$ 53,309		$ 54,611		$ 248,504		$ 251,271		$ 185,879
Total interest expense	2,311		2,204		2,413		2,649		2,795		3,644		3,934		4,162		9,577		14,535		21,092
Net Interest Income	54,898		57,265		59,701		67,063		72,124		64,788		49,375		50,449		238,927		236,736		164,787
Provision for loan and lease losses	2,350		2,875		3,750		4,500		4,750		500		2,150		0		13,475		7,400
Provision for losses on covered loans	2,511		(3,992)		11,688		15,685		(3,960)		433		2,301		(422)		25,892		(1,648)
Noninterest income (loss)	6,567		(911)		11,828		9,574		(9,602)		2,196		3,542		(5,419)		27,058		(9,283)		52,781
Noninterest expense	37,800		40,936		39,825		44,352		41,314		39,935		37,164		37,346		162,913		155,759		137,147
Income before income taxes	18,804		16,535		16,266		12,100		20,418		26,116		11,302		8,106		63,705		65,942		33,075
Provision (benefit) for income taxes	5,342		4,655		4,367		3,198		5,664		7,244		2,670		2,327		17,562		17,905		2,291
Net Income (Loss)	13,462		11,880		11,899		8,902		14,754		18,872		8,632		5,779		46,143		48,037		30,784
Net Income (Loss) Applicable to Common Shareholders																	$ 46,143		$ 48,037		$ 25,837
Per Common Share
Earnings (basic)	$ 0.34	[1]	$ 0.30	[1]	$ 0.30	[1]	$ 0.22	[1]	$ 0.37	[1]	$ 0.48	[1]	$ 0.22	[1]	$ 0.15	[1]	$ 1.16	[1]	$ 1.22	[1]	$ 0.73
Earnings (diluted)	$ 0.34	[1]	$ 0.30	[1]	$ 0.30	[1]	$ 0.22	[1]	$ 0.37	[1]	$ 0.48	[1]	$ 0.22	[1]	$ 0.15	[1]	$ 1.16	[1]	$ 1.21	[1]	$ 0.72

[1] Due to averaging of shares, quarterly earnings per share may not add up to the totals reported for the full year.