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	Mar. 31, 2013		Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
FINANCIAL ASSETS:
Cash and cash equivalents	$ 148,851		$ 223,532
Trading securities	3,183		3,747
Securities available for sale	2,396,617		2,625,229
Securities held to maturity	4,189		4,541
Loans held for sale	133,100		320,132
Non-covered loans and leases, net	6,663,186		6,681,080
Covered loans and leases, net	449,860		477,078
Restricted equity securities	32,783		33,443
Mortgage servicing rights	32,097		27,428	20,210	18,184
FDIC indemnification asset	46,046		52,798	78,417	91,089
FINANCIAL LIABILITIES:
Deposits	9,071,655		9,379,275
Securities sold under agreements to repurchase	142,810		137,075
Term debt	253,080		253,605
Junior subordinated debentures, at fair value	85,616		85,081
Junior subordinated debentures, at amortized cost	102,141		110,985
Carrying Value [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	718,188		543,787
Trading securities	3,183		3,747
Securities available for sale	2,396,617		2,625,229
Securities held to maturity	4,189		4,541
Loans held for sale	133,100		320,132
Non-covered loans and leases, net	6,578,494		6,595,689
Covered loans and leases, net	449,860		477,078
Restricted equity securities	32,783		33,443
Mortgage servicing rights	32,097		27,428
Bank owned life insurance assets	94,637		93,831
FDIC indemnification asset	46,046		52,798
Derivatives	23,609		23,842
Visa Class B common stock	0		0
FINANCIAL LIABILITIES:
Deposits	9,071,655		9,379,275
Securities sold under agreements to repurchase	142,810		137,075
Term debt	253,080		253,605
Junior subordinated debentures, at fair value	85,616		85,081
Junior subordinated debentures, at amortized cost	102,141		110,985
Derivatives	21,475		22,971
Estimated Fair Value [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	718,188		543,787
Trading securities	3,183		3,747
Securities available for sale	2,396,617		2,625,229
Securities held to maturity	4,361		4,732
Loans held for sale	133,100		320,132
Non-covered loans and leases, net	6,641,666		6,652,179
Covered loans and leases, net	512,780		543,628
Restricted equity securities	32,783		33,443
Mortgage servicing rights	32,097		27,428
Bank owned life insurance assets	94,637		93,831
FDIC indemnification asset	17,895		18,714
Derivatives	23,609		23,842
Visa Class B common stock	31,805		28,385
FINANCIAL LIABILITIES:
Deposits	9,087,201		9,396,646
Securities sold under agreements to repurchase	142,810		137,075
Term debt	286,585		289,404
Junior subordinated debentures, at fair value	85,616	[1]	85,081
Junior subordinated debentures, at amortized cost	70,649		78,529
Derivatives	$ 21,475		$ 22,971

[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.