Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	$ 1,294,478,000	$ 2,003,567,000
Total assets	1,301,423,000	2,012,160,000
Total liabilities	3,125,000	8,453,000
Fair value of warrants	218,000	40,000
Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	54,958,000	138,884,000
Total assets	54,960,000	138,907,000
Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	1,239,520,000	1,864,683,000
Total assets	1,246,245,000	1,873,213,000
Total liabilities	3,125,000	8,453,000
Fair Value Measurements, Level 3 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	218,000	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	501,226,000	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	501,226,000	825,082,000
State And Municipal Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	1,928,000	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	1,928,000	1,718,000
Mortgage-Backed Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	337,631,000	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	337,631,000	642,305,000
Collateralized Mortgage Obligations [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	16,486,000	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	16,486,000	25,194,000
Asset-Backed Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	166,000	240,000
Asset-Backed Securities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	166,000	240,000
Corporate Debt Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	380,429,000	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	380,429,000	369,425,000
Mutual Funds [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	6,035,000	3,927,000
Mutual Funds [Member] | Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	6,035,000	3,927,000
Preferred Stock Of Government Sponsored Entities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	1,654,000	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	1,654,000	719,000
Trust Preferred Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	45,963,000	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	45,963,000	14,437,000
Other Equity Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total securities available-for-sale	2,960,000	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	2,960,000	1,692,000
Trading Securities [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	4,542,000	3,818,000
Trading Securities [Member] | Fair Value Measurements, Level 1 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	2,000	23,000
Trading Securities [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	4,540,000	3,795,000
Warrants [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	218,000	40,000
Warrants [Member] | Fair Value Measurements, Level 3 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	218,000	40,000
Option Contracts [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	34,000	106,000
Total liabilities	5,000	72,000
Option Contracts [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	34,000	106,000
Total liabilities	5,000	72,000
Foreign Exchange Contracts [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	2,151,000	4,629,000
Total liabilities	486,000	1,873,000
Foreign Exchange Contracts [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total assets	2,151,000	4,629,000
Total liabilities	486,000	1,873,000
Interest Rate Swaps [Member]
Servicing Assets at Fair Value [Line Items]
Total liabilities	2,634,000	6,508,000
Interest Rate Swaps [Member] | Fair Value Measurements, Level 2 [Member]
Servicing Assets at Fair Value [Line Items]
Total liabilities	$ 2,634,000	$ 6,508,000