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, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Mar. 31, 2012
FINANCIAL ASSETS:
Cash and cash equivalents	$ 347,152		$ 178,685
Trading securities	9,420		5,958
Securities available for sale	2,588,969		1,790,978
Securities held to maturity	5,519		5,563
Loans held for sale	328,968		104,664
Non-covered loans and leases, net	14,830,345		7,354,403	6,797,890
Covered loans and leases, net	297,610		363,992
Restricted equity securities	122,194		30,685
Residential mortgage servicing rights	114,192	49,220	47,765	38,192		27,428	38,192	32,097
Bank owned life insurance assets	292,714		96,938
FDIC indemnification asset	11,293	18,362	23,174	36,263	46,046	52,798
FINANCIAL LIABILITIES:
Deposits	16,323,000		9,117,660
Securities sold under agreements to repurchase	315,025		224,882
Term debt	1,057,915		251,494
Junior subordinated debentures, at fair value	246,077		87,274
Junior subordinated debentures, at amortized cost	101,737		101,899
Level 1 [Member]
FINANCIAL ASSETS:
Residential mortgage servicing rights	0		0
Level 2 [Member]
FINANCIAL ASSETS:
Residential mortgage servicing rights	0		0
Level 3 [Member]
FINANCIAL ASSETS:
Residential mortgage servicing rights	114,192		47,765
Carrying Value [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	840,420		790,423
Trading securities	9,420		5,958
Securities available for sale	2,588,969		1,790,978
Securities held to maturity	5,519		5,563
Loans held for sale	328,968		104,664
Non-covered loans and leases, net	14,732,350		7,269,089
Covered loans and leases, net	297,610		363,992
Restricted equity securities	122,194		30,685
Residential mortgage servicing rights	114,192		47,765
Bank owned life insurance assets	292,714		96,938
FDIC indemnification asset	11,293		23,174
Derivatives	24,210		17,921
Visa Class B common stock	0		0
FINANCIAL LIABILITIES:
Deposits	16,323,000		9,117,660
Securities sold under agreements to repurchase	315,025		224,882
Term debt	1,057,915		251,494
Junior subordinated debentures, at fair value	246,077		87,274
Junior subordinated debentures, at amortized cost	101,737		101,899
Derivatives	25,904		14,562
Estimated Fair Value [Member] | Level 1 [Member]
FINANCIAL ASSETS:
Cash and cash equivalents	840,420		790,423
Restricted equity securities	122,194		30,685
Bank owned life insurance assets	292,714		96,938
Estimated Fair Value [Member] | Levels 1 and 2 [Member]
FINANCIAL ASSETS:
Trading securities	9,420		5,958
FINANCIAL LIABILITIES:
Deposits	16,326,488		9,125,832
Estimated Fair Value [Member] | Level 2 [Member]
FINANCIAL ASSETS:
Securities available for sale	2,588,969		1,790,978
Loans held for sale	328,968		104,664
FINANCIAL LIABILITIES:
Securities sold under agreements to repurchase	315,025		224,882
Term debt	1,083,704		270,004
Derivatives	25,904		14,562
Estimated Fair Value [Member] | Levels 2 and 3 [Member]
FINANCIAL ASSETS:
Derivatives	24,210		17,921
Estimated Fair Value [Member] | Level 3 [Member]
FINANCIAL ASSETS:
Securities held to maturity	5,783		5,874
Non-covered loans and leases, net	14,724,066		7,250,596
Covered loans and leases, net	301,961		409,555
Residential mortgage servicing rights	114,192		47,765
FDIC indemnification asset	3,329		6,001
Visa Class B common stock	40,733		41,700
FINANCIAL LIABILITIES:
Junior subordinated debentures, at fair value	246,077		87,274
Junior subordinated debentures, at amortized cost	$ 72,894		$ 72,009