Derivative Financial Instruments (Remaining Contract Maturity Of Fair Value Of OTC Derivative Assets And Liabilities) (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	$ 199,698
OTC derivative assets having maturity period of 1 to 5 years	249,535
OTC derivative assets having maturity period of greater than 5 years	60,695
OTC derivative assets cross-maturity netting	(108,563)
Total OTC derivative assets, net of cross-maturity netting	401,365
Cross product counterparty netting	(1,148)
Total OTC derivative assets included in Trading assets	400,217
OTC derivative liabilities having maturity period of 0 to 12 months	158,123
OTC derivative liabilities having maturity period of 1 to 5 years	134,394
OTC derivative liabilities having maturity period of greater than 5 years	164,487
OTC derivative liabilities cross-maturity netting	(108,563)
Total OTC derivative liabilities, net of cross-maturity netting	348,441
Cross product counterparty netting	(1,148)
Total OTC derivative liabilities included in Trading liabilities	347,293
Exchange traded derivative assets and other credit agreements	53,200
Cash collateral received	139,500
Exchange traded derivative liabilities and other credit agreements	270,400
Cash collateral pledged	226,800
Commodity Swaps, Options And Forwards [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	1,654
OTC derivative assets having maturity period of 1 to 5 years	8,002
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	0
Total OTC derivative assets, net of cross-maturity netting	9,656
OTC derivative liabilities having maturity period of 0 to 12 months	0
OTC derivative liabilities having maturity period of 1 to 5 years	0
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	0
Total OTC derivative liabilities, net of cross-maturity netting	0
Equity Swaps And Options [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	33,631
OTC derivative assets having maturity period of 1 to 5 years	2,646
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	0
Total OTC derivative assets, net of cross-maturity netting	36,277
OTC derivative liabilities having maturity period of 0 to 12 months	3,957
OTC derivative liabilities having maturity period of 1 to 5 years	18,813
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	0
Total OTC derivative liabilities, net of cross-maturity netting	22,770
Credit Default Swap [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	0
OTC derivative assets having maturity period of 1 to 5 years	6,362
OTC derivative assets having maturity period of greater than 5 years	1,009
OTC derivative assets cross-maturity netting	(1,194)
Total OTC derivative assets, net of cross-maturity netting	6,177
OTC derivative liabilities having maturity period of 0 to 12 months	0
OTC derivative liabilities having maturity period of 1 to 5 years	2,851
OTC derivative liabilities having maturity period of greater than 5 years	11,461
OTC derivative liabilities cross-maturity netting	(1,194)
Total OTC derivative liabilities, net of cross-maturity netting	13,118
Total Return Swap [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	22,128
OTC derivative assets having maturity period of 1 to 5 years	5,101
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(635)
Total OTC derivative assets, net of cross-maturity netting	26,594
OTC derivative liabilities having maturity period of 0 to 12 months	8,721
OTC derivative liabilities having maturity period of 1 to 5 years	2,738
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(635)
Total OTC derivative liabilities, net of cross-maturity netting	10,824
Foreign Currency Forwards, Swaps And Options [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	86,700
OTC derivative assets having maturity period of 1 to 5 years	12,391
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(5,083)
Total OTC derivative assets, net of cross-maturity netting	94,008
OTC derivative liabilities having maturity period of 0 to 12 months	109,643
OTC derivative liabilities having maturity period of 1 to 5 years	8,191
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(5,083)
Total OTC derivative liabilities, net of cross-maturity netting	112,751
Fixed Income Forwards [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative liabilities having maturity period of 0 to 12 months	2,053
OTC derivative liabilities having maturity period of 1 to 5 years	1,207
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	0
Total OTC derivative liabilities, net of cross-maturity netting	3,260
Interest Rate Swap [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	55,585
OTC derivative assets having maturity period of 1 to 5 years	215,033
OTC derivative assets having maturity period of greater than 5 years	59,686
OTC derivative assets cross-maturity netting	(101,651)
Total OTC derivative assets, net of cross-maturity netting	228,653
OTC derivative liabilities having maturity period of 0 to 12 months	33,749
OTC derivative liabilities having maturity period of 1 to 5 years	100,594
OTC derivative liabilities having maturity period of greater than 5 years	153,026
OTC derivative liabilities cross-maturity netting	(101,651)
Total OTC derivative liabilities, net of cross-maturity netting	$ 185,718