Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	$ 1,057,371,000	$ 2,003,567,000
Total assets	1,215,752,000	2,012,160,000
Total liabilities	8,333,000	8,453,000
Fair value of warrants	47,000	40,000
U.S. Treasury Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale		118,828,000
U.S. Treasury Securities [Member] | Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale		118,828,000
U.S. Government Sponsored Entities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	351,448,000	825,082,000
U.S. Government Sponsored Entities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	351,448,000	825,082,000
State And Municipal Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	1,887,000	1,718,000
State And Municipal Securities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	1,887,000	1,718,000
Mortgage-Backed Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	221,018,000	642,305,000
Mortgage-Backed Securities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	221,018,000	642,305,000
Collateralized Mortgage Obligations [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	18,685,000	25,194,000
Collateralized Mortgage Obligations [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	18,685,000	25,194,000
Asset-Backed Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	171,000	240,000
Asset-Backed Securities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	171,000	240,000
Corporate Debt Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	407,429,000	369,425,000
Corporate Debt Securities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	407,429,000	369,425,000
Mutual Funds [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	6,079,000	3,927,000
Mutual Funds [Member] | Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	6,079,000	3,927,000
Preferred Stock Of Government Sponsored Entities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	2,352,000	719,000
Preferred Stock Of Government Sponsored Entities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	2,352,000	719,000
Trust Preferred Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	46,074,000	14,437,000
Trust Preferred Securities [Member] | Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	46,074,000	14,437,000
Other Equity Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	2,228,000	1,692,000
Other Equity Securities [Member] | Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	2,228,000	1,692,000
Trading Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	156,977,000	3,818,000
Trading Securities [Member] | Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	152,462,000	23,000
Trading Securities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	4,515,000	3,795,000
Warrants [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	47,000	40,000
Warrants [Member] | Fair Value Measurements, Level 3 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	47,000	40,000
Option Contracts [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	161,000	106,000
Total liabilities	501,000	72,000
Option Contracts [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	161,000	106,000
Total liabilities	501,000	72,000
Foreign Exchange Contracts [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	1,196,000	4,629,000
Total liabilities	3,904,000	1,873,000
Foreign Exchange Contracts [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	1,196,000	4,629,000
Total liabilities	3,904,000	1,873,000
Interest Rate Swaps [Member]
Servicing Assets at Fair Value [Line Items]
Total liabilities	3,928,000	6,508,000
Interest Rate Swaps [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total liabilities	3,928,000	6,508,000
Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	54,381,000	138,884,000
Total assets	206,843,000	138,907,000
Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	1,002,990,000	1,864,683,000
Total assets	1,008,862,000	1,873,213,000
Total liabilities	8,333,000	8,453,000
Fair Value Measurements, Level 3 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	$ 47,000	$ 40,000