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Loans Receivable (excluding Covered Loans) (Loan Modifications) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013 Contracts	Mar. 31, 2012 Contracts	Mar. 31, 2013 Contracts	Mar. 31, 2012 Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	41	113	60	132
Recorded Investment	$ 8,886	$ 21,284	$ 14,313	$ 26,095
Single-Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	37	108	55	125
Recorded Investment	8,579	20,419	13,704	24,783
Construction - Speculative [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	0
Recorded Investment	0	0	0	0
Construction - Custom [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	0
Recorded Investment	0	0	0	0
Land - Acquisition & Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	0
Recorded Investment	0	0	0	0
Land - Consumer Lot Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	1	5	1	7
Recorded Investment	139	865	139	1,312
Multi-Family [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	1	0	1	0
Recorded Investment	55	0	55	0
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	1	0
Recorded Investment	0	0	302	0
Commercial & Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	0
Recorded Investment	0	0	0	0
HELOC [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	2	0	2	0
Recorded Investment	113	0	113	0
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0

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