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, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Total interest income	$ 78,307		$ 81,599		$ 82,268		$ 54,761		$ 57,209		$ 59,469		$ 62,114		$ 69,712		$ 296,935		$ 248,504		$ 251,271
Total interest expense	1,098		1,184		2,279		1,279		2,311		2,204		2,413		2,649		5,840		9,577		14,535
Net Interest Income	77,209		80,415		79,989		53,482		54,898		57,265		59,701		67,063		291,095		238,927		236,736
Provision for loan and lease losses	(2,100)		4,260		2,000		(1,000)		2,350		2,875		3,750		4,500		3,160		13,475
Provision for losses on covered loans	(1,582)		(947)		(1,712)		980		2,511		(3,992)		11,688		15,685		(3,261)		25,892
Noninterest income (loss)	10,612		7,622		6,808		1,658		6,567		(911)		11,828		9,574		26,700		27,058		(9,283)
Noninterest expense	63,619		64,714		64,504		38,049		37,800		40,936		39,825		44,352		230,886		162,913		155,759
Income before income taxes	27,884		20,010		22,005		17,111		18,804		16,535		16,266		12,100		87,010		63,705		65,942
Income tax expense (benefit)	7,911		6,734		7,414		4,935		5,342		4,655		4,367		3,198		26,994		17,562		17,905
Net Income (Loss)	$ 19,973		$ 13,276		$ 14,591		$ 12,176		$ 13,462		$ 11,880		$ 11,899		$ 8,902		$ 60,016		$ 46,143		$ 48,037
Per Common Share
Earnings (basic)	$ 0.39	[1]	$ 0.26	[1]	$ 0.28	[1]	$ 0.31	[1]	$ 0.34	[1]	$ 0.30	[1]	$ 0.30	[1]	$ 0.22	[1]	$ 1.24	[1]	$ 1.16	[1]	$ 1.22
Earnings (diluted)	$ 0.38	[1]	$ 0.25	[1]	$ 0.28	[1]	$ 0.31	[1]	$ 0.34	[1]	$ 0.30	[1]	$ 0.30	[1]	$ 0.22	[1]	$ 1.21	[1]	$ 1.16	[1]	$ 1.21

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