Investment Securities (Amortized Cost And Fair Value Of Total Debt Securities) (Details) (USD $) In Thousands	Sep. 30, 2011
Investment Securities [Abstract]
Securities available for sale, Within one year - Amortized Cost	$ 29,910
Securities available for sale, Within one year - Fair Value	30,523
Securities available for sale, After one year but within five years - Amortized Cost	242,547
Securities available for sale, After one year but within five years - Fair Value	245,806
Securities available for sale, After five years but within ten years - Amortized Cost	497,607
Securities available for sale, After five years but within ten years - Fair Value	508,534
Securities available for sale, After ten years - Amortized Cost	1,732,501
Securities available for sale, After ten years - Fair Value	1,758,884
Securities available for sale - Amortized Cost	2,502,565
Securities available for sale - Fair Value	2,543,747
Securities held to maturity, Within one year - Amortized Cost	0
Securities held to maturity, Within one year - Fair Value	0
Securities held to maturity, After one year but within five years - Amortized Cost	0
Securities held to maturity, After one year but within five years - Fair Value	0
Securities held to maturity, After five years but within ten years - Amortized Cost	0
Securities held to maturity, After five years but within ten years - Fair Value	0
Securities held to maturity, After ten years - Amortized Cost	8,477
Securities held to maturity, After ten years - Fair Value	8,477
Securities held to maturity - Amortized Cost	8,477
Securities held to maturity - Fair Value	$ 8,477

This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682