Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Total securities available-for-sale	$ 1,184,504,000	$ 2,003,567,000
Total assets	1,191,027,000	2,012,160,000
Total liabilities	5,781,000	8,453,000
Fair value of warrants	58,000	40,000
U.S. Treasury Securities [Member]
Total securities available-for-sale	121,982,000	118,828,000
U.S. Treasury Securities [Member] | Fair Value Measurement, Level 1 [Member]
Total securities available-for-sale	121,982,000	118,828,000
U.S. Government Sponsored Entities [Member]
Total securities available-for-sale	209,852,000	825,082,000
U.S. Government Sponsored Entities [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	209,852,000	825,082,000
State And Municipal Securities [Member]
Total securities available-for-sale	1,812,000	1,718,000
State And Municipal Securities [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	1,812,000	1,718,000
Mortgage-Backed Securities [Member]
Total securities available-for-sale	400,320,000	642,305,000
Mortgage-Backed Securities [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	400,320,000	642,305,000
Collateralized Mortgage Obligations [Member]
Total securities available-for-sale	20,315,000	25,194,000
Collateralized Mortgage Obligations [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	20,315,000	25,194,000
Asset-Backed Securities [Member]
Total securities available-for-sale	183,000	240,000
Asset-Backed Securities [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	183,000	240,000
Corporate Bonds [Member]
Total securities available-for-sale	335,833,000	331,991,000
Corporate Bonds [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	335,833,000	331,991,000
Mutual Funds [Member]
Total securities available-for-sale	3,967,000	3,927,000
Mutual Funds [Member] | Fair Value Measurement, Level 1 [Member]
Total securities available-for-sale	3,967,000	3,927,000
Preferred Stock Of Government Sponsored Entities [Member]
Total securities available-for-sale	3,383,000	719,000
Preferred Stock Of Government Sponsored Entities [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	3,383,000	719,000
Trust Preferred Securities [Member]
Total securities available-for-sale	26,461,000	14,437,000
Trust Preferred Securities [Member] | Fair Value Measurement, Level 1 [Member]
Total securities available-for-sale	26,461,000	14,437,000
Other Foreign Debt Securities [Member]
Total securities available-for-sale	57,366,000	37,434,000
Other Foreign Debt Securities [Member] | Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	57,366,000	37,434,000
Other Equity Securities [Member]
Total securities available-for-sale	3,030,000	1,692,000
Other Equity Securities [Member] | Fair Value Measurement, Level 1 [Member]
Total securities available-for-sale	3,030,000	1,692,000
Trading Securities [Member]
Total assets	4,599,000	3,818,000
Trading Securities [Member] | Fair Value Measurement, Level 1 [Member]
Total assets	3,000	23,000
Trading Securities [Member] | Fair Value Measurement, Level 2 [Member]
Total assets	4,596,000	3,795,000
Warrants [Member]
Total assets	58,000	40,000
Warrants [Member] | Fair Value Measurement, Level 3 [Member]
Total assets	58,000	40,000
Option Contracts [Member]
Total assets	129,000	106,000
Total liabilities	46,000	72,000
Option Contracts [Member] | Fair Value Measurement, Level 2 [Member]
Total assets	129,000	106,000
Total liabilities	46,000	72,000
Foreign Exchange Contract [Member]
Total assets	1,737,000	4,629,000
Total liabilities	391,000	1,873,000
Foreign Exchange Contract [Member] | Fair Value Measurement, Level 2 [Member]
Total assets	1,737,000	4,629,000
Total liabilities	391,000	1,873,000
Interest Rate Swap [Member]
Total liabilities	5,344,000	6,508,000
Interest Rate Swap [Member] | Fair Value Measurement, Level 2 [Member]
Total liabilities	5,344,000	6,508,000
Fair Value Measurement, Level 1 [Member]
Total securities available-for-sale	155,440,000	138,884,000
Total assets	155,443,000	138,907,000
Fair Value Measurement, Level 2 [Member]
Total securities available-for-sale	1,029,064,000	1,864,683,000
Total assets	1,035,526,000	1,873,213,000
Total liabilities	5,781,000	8,453,000
Fair Value Measurement, Level 3 [Member]
Total assets	$ 58,000	$ 40,000