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	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
FINANCIAL ASSETS:
Cash and cash equivalents	$ 143,409			$ 223,532
Trading securities	3,863			3,747
Securities available for sale	2,083,755			2,625,229
Securities held to maturity	3,741			4,541
Loans held for sale	173,994			320,132
Non-covered loans and leases, net	6,787,117			6,681,080
Covered loans and leases, net	419,059			477,078
Restricted equity securities	32,112			33,443
Mortgage servicing rights	38,192		32,097	27,428	22,513	20,210	18,184
FDIC indemnification asset	36,263		46,046	52,798	68,805	78,417	91,089
FINANCIAL LIABILITIES:
Deposits	8,956,325			9,379,275
Securities sold under agreements to repurchase	176,447			137,075
Term debt	252,543			253,605
Junior subordinated debentures, at fair value	86,159			85,081
Junior subordinated debentures, at amortized cost	102,060			110,985
Carrying Value [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	804,994			543,787
Trading securities	3,863			3,747
Securities available for sale	2,083,755			2,625,229
Securities held to maturity	3,741			4,541
Loans held for sale	173,994			320,132
Non-covered loans and leases, net	6,701,281			6,595,689
Covered loans and leases, net	419,059			477,078
Restricted equity securities	32,112			33,443
Mortgage servicing rights	38,192			27,428
Bank owned life insurance assets	95,459			93,831
FDIC indemnification asset	36,263			52,798
Derivatives	21,883			23,842
Visa Class B common stock	0			0
FINANCIAL LIABILITIES:
Deposits	8,956,325			9,379,275
Securities sold under agreements to repurchase	176,447			137,075
Term debt	252,543			253,605
Junior subordinated debentures, at fair value	86,159			85,081
Junior subordinated debentures, at amortized cost	102,060			110,985
Derivatives	9,001			22,971
Estimated Fair Value [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	804,994			543,787
Trading securities	3,863			3,747
Securities available for sale	2,083,755			2,625,229
Securities held to maturity	3,890			4,732
Loans held for sale	173,994			320,132
Non-covered loans and leases, net	6,675,579			6,652,179
Covered loans and leases, net	474,159			543,628
Restricted equity securities	32,112			33,443
Mortgage servicing rights	38,192			27,428
Bank owned life insurance assets	95,459			93,831
FDIC indemnification asset	12,435			18,714
Derivatives	21,883			23,842
Visa Class B common stock	34,222			28,385
FINANCIAL LIABILITIES:
Deposits	8,966,028			9,396,646
Securities sold under agreements to repurchase	176,447			137,075
Term debt	281,080			289,404
Junior subordinated debentures, at fair value	86,159	[1]		85,081
Junior subordinated debentures, at amortized cost	71,095			78,529
Derivatives	$ 9,001			$ 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.