Covered Assets And Indemnification Asset (Allowance And Recorded Investment By Covered Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Covered loans and leases [Member]		Mar. 31, 2011 Covered loans and leases [Member]		Mar. 31, 2012 Commercial Real Estate [Member] Covered loans and leases [Member]		Mar. 31, 2011 Commercial Real Estate [Member] Covered loans and leases [Member]		Mar. 31, 2012 Commercial [Member] Covered loans and leases [Member]		Mar. 31, 2011 Commercial [Member] Covered loans and leases [Member]		Mar. 31, 2012 Residential [Member] Covered loans and leases [Member]		Mar. 31, 2011 Residential [Member] Covered loans and leases [Member]		Mar. 31, 2012 Consumer & Other [Member] Covered loans and leases [Member]		Mar. 31, 2011 Consumer & Other [Member] Covered loans and leases [Member]
Accelerated Share Repurchases [Line Items]
Loans acquired with deteriorated credit quality			$ 11,463	[1]	$ 7,472	[1]	$ 7,765	[1]	$ 4,851	[1]	$ 2,717	[1]	$ 1,292	[1]	$ 700	[1]	$ 936	[1]	$ 281	[1]	$ 393	[1]
Collectively evaluated for impairment			1,172	[2]	771		533	[2]	217		558	[2]	508		40	[2]	26		41	[2]	20
Total	12,635	14,320	12,635		8,243		8,298		5,068		3,275		1,800		740		962		322		413
Covered loans and leases, Loans acquired with deteriorated credit quality			578,346	[1]	711,550	[1]	485,058	[1]	580,072	[1]	34,311	[1]	50,949	[1]	54,305	[1]	72,508	[1]	4,672	[1]	8,021	[1]
Covered loans and leases, Collectively evaluated for impairment			27,468	[2]	30,080		2,801	[2]	4,403		17,480	[2]	20,070		4,647	[2]	3,697		2,540	[2]	1,910
Covered loans and leases, Total			$ 605,814		$ 741,630		$ 487,859		$ 584,475		$ 51,791		$ 71,019		$ 58,952		$ 76,205		$ 7,212		$ 9,931

[1] In accordance with ASC 310-30, the valuation allowance is netted against the carrying value of the covered loan and lease balance.

[2] The allowance on covered loan and lease losses includes an allowance on covered loan advances on acquired loans subsequent to acquisition.