Loans and Allowance for Loan Losses (Schedule Of Current, Accruing Past Due And Nonaccrual Loans) (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	$ 19,067,908,000		$ 18,913,905,000
Accruing 30-89 Days Past Due	76,082,000		98,014,000
Accruing 90 Days or Greater Past Due	4,596,000		6,811,000
Total Accruing Past Due	80,678,000		104,825,000
Non-accrual	483,464,000		543,333,000
Total loans	19,632,050,000	[1]	19,562,063,000	[2]	19,693,445,000
Deferred fees and costs, net	23,800,000		20,400,000		13,300,000
Home Equity Lines [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,482,730,000		1,515,396,000
Accruing 30-89 Days Past Due	6,156,000		9,555,000
Accruing 90 Days or Greater Past Due	272,000		705,000
Total Accruing Past Due	6,428,000		10,260,000
Non-accrual	18,580,000		16,741,000
Total loans	1,507,738,000		1,542,397,000
Consumer Mortgages [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,390,307,000		1,348,506,000
Accruing 30-89 Days Past Due	21,409,000		22,502,000
Accruing 90 Days or Greater Past Due	1,058,000		1,288,000
Total Accruing Past Due	22,467,000		23,790,000
Non-accrual	38,438,000		39,265,000
Total loans	1,451,212,000		1,411,561,000
Credit Cards [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	248,185,000		258,698,000
Accruing 30-89 Days Past Due	1,784,000		2,450,000
Accruing 90 Days or Greater Past Due	1,819,000		2,413,000
Total Accruing Past Due	3,603,000		4,863,000
Non-accrual	0		0
Total loans	251,788,000		263,561,000
Small Business [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	559,959,000		505,526,000
Accruing 30-89 Days Past Due	3,834,000		4,935,000
Accruing 90 Days or Greater Past Due	46,000		338,000
Total Accruing Past Due	3,880,000		5,273,000
Non-accrual	5,042,000		5,550,000
Total loans	568,881,000		516,349,000
Other Retail Loans [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	274,302,000		271,175,000
Accruing 30-89 Days Past Due	2,429,000		3,135,000
Accruing 90 Days or Greater Past Due	7,000		24,000
Total Accruing Past Due	2,436,000		3,159,000
Non-accrual	1,865,000		2,895,000
Total loans	278,603,000		277,229,000
Investment Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	4,290,084,000		4,278,016,000
Accruing 30-89 Days Past Due	8,071,000		5,436,000
Accruing 90 Days or Greater Past Due	0		798,000
Total Accruing Past Due	8,071,000		6,234,000
Non-accrual	94,368,000		91,868,000
Total loans	4,392,523,000		4,376,118,000
1-4 Family Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,136,964,000		1,193,433,000
Accruing 30-89 Days Past Due	6,089,000		13,053,000
Accruing 90 Days or Greater Past Due	246,000		41,000
Total Accruing Past Due	6,335,000		13,094,000
Non-accrual	54,188,000		72,578,000
Total loans	1,197,487,000		1,279,105,000
Land Acquisition [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	591,534,000		599,034,000
Accruing 30-89 Days Past Due	4,583,000		3,422,000
Accruing 90 Days or Greater Past Due	0		298,000
Total Accruing Past Due	4,583,000		3,720,000
Non-accrual	156,202,000		191,475,000
Total loans	752,319,000		794,229,000
Commercial Real Estate [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,018,582,000		6,070,483,000
Accruing 30-89 Days Past Due	18,743,000		21,911,000
Accruing 90 Days or Greater Past Due	246,000		1,137,000
Total Accruing Past Due	18,989,000		23,048,000
Non-accrual	304,758,000		355,921,000
Total loans	6,342,329,000		6,449,452,000
Commercial and Industrial [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	9,093,843,000		8,944,121,000
Accruing 30-89 Days Past Due	21,727,000		33,526,000
Accruing 90 Days or Greater Past Due	1,148,000		906,000
Total Accruing Past Due	22,875,000		34,432,000
Non-accrual	114,781,000		122,961,000
Total loans	9,231,499,000		9,101,514,000
Retail [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	3,955,483,000		3,899,301,000
Accruing 30-89 Days Past Due	35,612,000		42,577,000
Accruing 90 Days or Greater Past Due	3,202,000		4,768,000
Total Accruing Past Due	38,814,000		47,345,000
Non-accrual	63,925,000		64,451,000
Total loans	$ 4,058,222,000		$ 4,011,097,000

[1] Total before net deferred fees and costs of $23.8 million

[2] Total before net deferred fees and costs of $20.4 million