Loans Receivable (excluding Covered Loans) (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012 Contracts	Dec. 31, 2011 Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	118	825
Pre-Modification Outstanding Recorded Investment	$ 33,746	$ 212,297
Post-Modification Outstanding Recorded Investment	33,746	212,297
Loan Modification, Basis Point Reduction, Minimum	1.00%
Loan Modification, Basis Point Reduction, Maximum	2.00%
Single Family Residential Loans as Percentage of Restructured Loans	84.00%
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	105	700
Pre-Modification Outstanding Recorded Investment	29,339	183,492
Post-Modification Outstanding Recorded Investment	29,339	183,492
Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	1	24
Pre-Modification Outstanding Recorded Investment	2,503	6,409
Post-Modification Outstanding Recorded Investment	2,503	6,409
Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	0	1
Pre-Modification Outstanding Recorded Investment	0	1,196
Post-Modification Outstanding Recorded Investment	0	1,196
Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	0	25
Pre-Modification Outstanding Recorded Investment	0	8,524
Post-Modification Outstanding Recorded Investment	0	8,524
Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	11	65
Pre-Modification Outstanding Recorded Investment	1,836	9,017
Post-Modification Outstanding Recorded Investment	1,836	9,017
Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	1	5
Pre-Modification Outstanding Recorded Investment	68	3,161
Post-Modification Outstanding Recorded Investment	68	3,161
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	0	1
Pre-Modification Outstanding Recorded Investment	0	308
Post-Modification Outstanding Recorded Investment	0	308
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	0	1
Pre-Modification Outstanding Recorded Investment	0	5
Post-Modification Outstanding Recorded Investment	0	5
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	0	3
Pre-Modification Outstanding Recorded Investment	0	185
Post-Modification Outstanding Recorded Investment	0	185
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts (in contracts)	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0