Fair Value Of Financial Instruments (Narrative) (Details) (USD $)	Dec. 31, 2012	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans individually evaluated for impairment	$ 23,115,000	$ 26,890,000
OREO	6,259,000	8,047,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of non-certificate deposits	2,060,000,000	1,980,000,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of certificates of deposit	$ 2,570,000,000	$ 2,630,000,000