Fair Value Measurement (Schedule Of Carrying Value And Fair Value Of Financial Instruments Not Recorded At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 223,532		$ 152,265
Trading securities	3,747		2,309
Securities available for sale	2,625,229		3,168,578
Securities held to maturity	4,541		4,714
Loans held for sale	320,132		102,098
Non-covered loans and leases, net	6,681,080		5,888,098
Covered loans and leases, net	477,078		622,451
Restricted equity securities	33,443		32,581
Mortgage servicing rights	27,428		18,184	14,454	12,625
FDIC indemnification asset	52,798		91,089	146,413
Derivatives	23,942		7,955
Deposits	9,379,275		9,236,690	9,433,805
Securities sold under agreements to repurchase	137,075		124,605
Term debt	253,605		255,676
Junior subordinated debentures, at fair value	85,081		82,905
Junior subordinated debentures, at amortized cost	110,985		102,544
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	543,787		598,766
Trading securities	3,747		2,309
Securities available for sale	2,625,229		3,168,578
Securities held to maturity	4,541		4,714
Loans held for sale	320,132		102,098
Non-covered loans and leases, net	6,595,689		5,795,130
Covered loans and leases, net	477,078		622,451
Restricted equity securities	33,443		32,581
Mortgage servicing rights	27,428		18,184
Bank owned life insurance assets	93,831		92,555
FDIC indemnification asset	52,798		91,089
Derivatives	23,842		7,955
Deposits	9,379,275		9,236,690
Securities sold under agreements to repurchase	137,075		124,605
Term debt	253,605		255,676
Junior subordinated debentures, at fair value	85,081		82,905
Junior subordinated debentures, at amortized cost	110,985		102,544
Derivatives	22,971		6,509
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	543,787		598,766
Trading securities	3,747		2,309
Securities available for sale	2,625,229		3,168,578
Securities held to maturity	4,732		4,759
Loans held for sale	320,132		102,098
Non-covered loans and leases, net	6,652,179		5,816,714
Covered loans and leases, net	543,628		722,295
Restricted equity securities	33,443		32,581
Mortgage servicing rights	27,428		18,184
Bank owned life insurance assets	93,831		92,555
FDIC indemnification asset	18,714		47,008
Derivatives	23,842		7,955
Visa Class B common stock	28,385		19,230
Deposits	9,396,646		9,260,327
Securities sold under agreements to repurchase	137,075		124,605
Term debt	289,404		284,911
Junior subordinated debentures, at fair value	85,081	[1]	82,905
Junior subordinated debentures, at amortized cost	78,529		68,698
Derivatives	$ 22,971		$ 6,509

[1] Includes purchase accounting adjustments, net of accumulated amortization, for junior subordinated debentures assumed in connection with previous mergers as well as fair value adjustments related to trusts recorded at fair value.