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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, 2012 Contracts	Mar. 31, 2011 Contracts	Mar. 31, 2012 Contracts	Mar. 31, 2011 Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	113	53	132	95
Recorded Investment	$ 21,284	$ 19,346	$ 26,095	$ 31,934
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	108	47	125	87
Recorded Investment	20,419	11,801	24,783	19,763
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 and Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	1
Recorded Investment	0	0	0	4,505
Land, Consumer Lot Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	5	3	7	4
Recorded Investment	865	710	1,312	831
Multi Family Housing [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	2	0	2
Recorded Investment	0	6,613	0	6,613
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	1	0	1
Recorded Investment	0	222	0	222
Commercial and Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	0
Recorded Investment	0	0	0	0
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts (in contracts)	0	0	0	0
Recorded Investment	0	0	0	0
Consumer Portfolio Segment [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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