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	Sep. 30, 2013		Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
FINANCIAL ASSETS:
Cash and cash equivalents	$ 193,188			$ 223,532
Trading securities	4,012			3,747
Securities available for sale	1,910,082			2,625,229
Securities held to maturity	5,766			4,541
Loans held for sale	113,993			320,132
Non-covered loans and leases, net	7,228,904			6,681,080
Covered loans and leases, net	397,083			477,078
Restricted equity securities	31,444			33,443
Mortgage servicing rights	41,853		38,192	27,428	24,489	22,513	18,184
FDIC indemnification asset	29,427		36,263	52,798	60,506	68,805	91,089
FINANCIAL LIABILITIES:
Deposits	9,067,240			9,379,275
Securities sold under agreements to repurchase	215,310			137,075
Term debt	252,017			253,605
Junior subordinated debentures, at fair value	86,718			85,081
Junior subordinated debentures, at amortized cost	101,979			110,985
Carrying Value [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	697,091			543,787
Trading securities	4,012			3,747
Securities available for sale	1,910,082			2,625,229
Securities held to maturity	5,766			4,541
Loans held for sale	113,993			320,132
Non-covered loans and leases, net	7,144,210			6,595,689
Covered loans and leases, net	397,083			477,078
Restricted equity securities	31,444			33,443
Mortgage servicing rights	41,853			27,428
Bank owned life insurance assets	94,637			93,831
FDIC indemnification asset	29,427			52,798
Derivatives	17,485			23,842
Visa Class B common stock	0			0
FINANCIAL LIABILITIES:
Deposits	9,067,240			9,379,275
Securities sold under agreements to repurchase	215,310			137,075
Term debt	252,017			253,605
Junior subordinated debentures, at fair value	86,718			85,081
Junior subordinated debentures, at amortized cost	101,979			110,985
Derivatives	16,995			22,971
Estimated Fair Value [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	697,091			543,787
Trading securities	4,012			3,747
Securities available for sale	1,910,082			2,625,229
Securities held to maturity	6,030			4,732
Loans held for sale	113,993			320,132
Non-covered loans and leases, net	7,110,101			6,652,179
Covered loans and leases, net	449,239			543,628
Restricted equity securities	31,444			33,443
Mortgage servicing rights	41,853			27,428
Bank owned life insurance assets	94,637			93,831
FDIC indemnification asset	6,980			18,714
Derivatives	17,485			23,842
Visa Class B common stock	35,786			28,385
FINANCIAL LIABILITIES:
Deposits	9,077,231			9,396,646
Securities sold under agreements to repurchase	215,310			137,075
Term debt	279,183			289,404
Junior subordinated debentures, at fair value	86,718	[1]		85,081
Junior subordinated debentures, at amortized cost	71,553			78,529
Derivatives	$ 16,995			$ 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.