Derivative Financial Instruments (Remaining Contract Maturity Of Fair Value Of OTC Derivative Assets And Liabilities) (Details) $ in Thousands	Sep. 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	$ 183,623
OTC derivative assets having maturity period of 1 to 5 years	274,079
OTC derivative assets having maturity period of greater than 5 years	88,435
OTC derivative assets cross-maturity netting	(106,072)
Total OTC derivative assets, net of cross-maturity netting	440,065
Cross product counterparty netting	(754)
Total OTC derivative assets included in Trading assets	439,311
OTC derivative liabilities having maturity period of 0 to 12 months	183,065
OTC derivative liabilities having maturity period of 1 to 5 years	194,176
OTC derivative liabilities having maturity period of greater than 5 years	126,213
OTC derivative liabilities cross-maturity netting	(106,072)
Total OTC derivative liabilities, net of cross-maturity netting	397,382
Cross product counterparty netting	(754)
Total OTC derivative liabilities included in Trading liabilities	396,628
Exchange traded derivative assets and other credit agreements	25,600
Cash collateral received	134,000
Exchange traded derivative liabilities and other credit agreements	193,200
Cash collateral pledged	216,100
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	1,427
OTC derivative assets having maturity period of 1 to 5 years	0
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(1,057)
Total OTC derivative assets, net of cross-maturity netting	370
OTC derivative liabilities having maturity period of 0 to 12 months	1,051
OTC derivative liabilities having maturity period of 1 to 5 years	1,254
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(1,057)
Total OTC derivative liabilities, net of cross-maturity netting	1,248
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	27,781
OTC derivative assets having maturity period of 1 to 5 years	5,370
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	33,151
OTC derivative liabilities having maturity period of 0 to 12 months	13,408
OTC derivative liabilities having maturity period of 1 to 5 years	23,617
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	37,025
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	7,948
OTC derivative assets having maturity period of greater than 5 years	230
OTC derivative assets cross-maturity netting	(177)
Total OTC derivative assets, net of cross-maturity netting	8,001
OTC derivative liabilities having maturity period of 0 to 12 months	28
OTC derivative liabilities having maturity period of 1 to 5 years	12,639
OTC derivative liabilities having maturity period of greater than 5 years	1,672
OTC derivative liabilities cross-maturity netting	(177)
Total OTC derivative liabilities, net of cross-maturity netting	14,162
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	27,796
OTC derivative assets having maturity period of 1 to 5 years	874
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(613)
Total OTC derivative assets, net of cross-maturity netting	28,057
OTC derivative liabilities having maturity period of 0 to 12 months	26,824
OTC derivative liabilities having maturity period of 1 to 5 years	16,967
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(613)
Total OTC derivative liabilities, net of cross-maturity netting	43,178
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	84,564
OTC derivative assets having maturity period of 1 to 5 years	29,937
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(7,150)
Total OTC derivative assets, net of cross-maturity netting	107,351
OTC derivative liabilities having maturity period of 0 to 12 months	113,001
OTC derivative liabilities having maturity period of 1 to 5 years	20,024
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(7,150)
Total OTC derivative liabilities, net of cross-maturity netting	125,875
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	5,044
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	5,044
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	42,055
OTC derivative assets having maturity period of 1 to 5 years	229,950
OTC derivative assets having maturity period of greater than 5 years	88,205
OTC derivative assets cross-maturity netting	(97,075)
Total OTC derivative assets, net of cross-maturity netting	263,135
OTC derivative liabilities having maturity period of 0 to 12 months	23,709
OTC derivative liabilities having maturity period of 1 to 5 years	119,675
OTC derivative liabilities having maturity period of greater than 5 years	124,541
OTC derivative liabilities cross-maturity netting	(97,075)
Total OTC derivative liabilities, net of cross-maturity netting	$ 170,850