Derivatives (Derivatives Associated with Capital Markets Trading Activities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Customer Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional	$ 1,731,047	$ 1,742,060
Assets	69,878	88,154
Liabilities	5,778	6,880
Offsetting Upstream Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional	1,731,047	1,742,060
Assets	5,778	6,880
Liabilities	69,878	88,154
Put Option [Member] | Short [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional	7,500
Assets	0
Liabilities	6
Put Option [Member] | Long [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional	10,000
Assets	27
Liabilities	0
Forwards And Futures Purchased [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional	1,866,521	1,664,813
Assets	2,047	208
Liabilities	614	9,296
Forwards And Futures Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional	2,311,144	2,038,677
Assets	1,134	16,669
Liabilities	$ 2,281	$ 474