Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Not Measured At Fair Value By Level) (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
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 193,188		$ 223,532
Securities held to maturity	5,766		4,541
Loans held for sale, at fair value	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
FDIC indemnification asset	29,427	36,263	52,798	60,506	68,805	91,089
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 amortized cost	101,979		110,985
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale, at fair value	113,993		320,132
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	697,091		543,787
Securities held to maturity	4,012		4,732
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
Bank owned life insurance assets	94,637		93,831
FDIC indemnification asset	6,980		18,714
Visa Class B common stock	35,786		28,385
Securities sold under agreements to repurchase	215,310		137,075
Term debt	279,183		289,404
Junior subordinated debentures, at amortized cost	71,553		78,529
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	697,091		543,787
Securities held to maturity	0		0
Non-covered loans and leases, net	0		0
Covered loans and leases, net	0		0
Restricted equity securities	31,444		33,443
Bank owned life insurance assets	94,637		93,831
FDIC indemnification asset	0		0
Visa Class B common stock	0		0
Securities sold under agreements to repurchase	0		0
Term debt	0		0
Junior subordinated debentures, at amortized cost	0		0
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0		0
Securities held to maturity	0		0
Non-covered loans and leases, net	0		0
Covered loans and leases, net	0		0
Restricted equity securities	0		0
Bank owned life insurance assets	0		0
FDIC indemnification asset	0		0
Visa Class B common stock	0		0
Securities sold under agreements to repurchase	215,310		137,075
Term debt	279,183		289,404
Junior subordinated debentures, at amortized cost	0		0
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0		0
Securities held to maturity	4,012		4,732
Non-covered loans and leases, net	7,110,101		6,652,179
Covered loans and leases, net	449,239		543,628
Restricted equity securities	0		0
Bank owned life insurance assets	0		0
FDIC indemnification asset	6,980		18,714
Visa Class B common stock	35,786		28,385
Securities sold under agreements to repurchase	0		0
Term debt	0		0
Junior subordinated debentures, at amortized cost	71,553		78,529
Estimated Fair Value [Member] | Non-Maturity Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	7,434,771		7,376,288
Estimated Fair Value [Member] | Non-Maturity Deposits [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	7,434,771		7,376,288
Estimated Fair Value [Member] | Non-Maturity Deposits [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	0		0
Estimated Fair Value [Member] | Non-Maturity Deposits [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	0		0
Estimated Fair Value [Member] | Deposits with Stated Maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	1,642,460		2,020,358
Estimated Fair Value [Member] | Deposits with Stated Maturities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	0		0
Estimated Fair Value [Member] | Deposits with Stated Maturities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	1,642,460		2,020,358
Estimated Fair Value [Member] | Deposits with Stated Maturities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	$ 0		$ 0