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Loans Receivable (excluding Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 7,768,417	$ 7,866,336
Ratio of type of loan to total loans receivable	100.00%	100.00%
Allowance for probable losses	118,104	133,147	122,884	157,160
Loans in process	189,677	213,286
Discount on acquired loans	37,568	33,484
Deferred net origination fees	32,562	34,421
Charges against loans receivable	377,911	414,338
Loans receivable, net	7,390,506	7,451,998
Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,269,293	5,779,264
Ratio of type of loan to total loans receivable	67.80%	73.50%
Allowance for probable losses	67,386	81,815	77,422	83,307
Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	116,363	131,526
Ratio of type of loan to total loans receivable	1.50%	1.60%
Allowance for probable losses	7,733	12,060	7,757	13,828
Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	237,952	211,690
Ratio of type of loan to total loans receivable	3.10%	2.70%
Allowance for probable losses	279	347	262	623
Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	91,452	128,379
Ratio of type of loan to total loans receivable	1.10%	1.70%
Allowance for probable losses	11,384	15,598	12,221	32,719
Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	132,360	141,844
Ratio of type of loan to total loans receivable	1.80%	1.80%
Allowance for probable losses	3,975	4,937	3,941	5,520
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	749,253	710,741
Ratio of type of loan to total loans receivable	9.60%	9.00%
Allowance for probable losses	3,358	5,280	4,272	7,623
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	639,373	406,364
Ratio of type of loan to total loans receivable	8.30%	5.20%
Allowance for probable losses	5,291	1,956	4,156	4,331
Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	336,843	166,115
Ratio of type of loan to total loans receivable	4.30%	2.10%
Allowance for probable losses	13,854	7,626	8,628	5,099
HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	134,899	126,942
Ratio of type of loan to total loans receivable	1.70%	1.60%
Allowance for probable losses	994	965	1,031	1,139
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	60,629	63,471
Ratio of type of loan to total loans receivable	0.80%	0.80%
Allowance for probable losses	3,850	2,563	3,194	2,971
Non-Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	7,364,314	7,755,219
Ratio of type of loan to total loans receivable	94.80%	98.60%
Non-Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,253,604	5,778,922
Ratio of type of loan to total loans receivable	67.60%	73.50%
Non-Acquired Loans [Member] | Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	116,363	129,637
Ratio of type of loan to total loans receivable	1.50%	1.60%
Non-Acquired Loans [Member] | Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	237,952	211,690
Ratio of type of loan to total loans receivable	3.10%	2.70%
Non-Acquired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	85,248	124,677
Ratio of type of loan to total loans receivable	1.10%	1.60%
Non-Acquired Loans [Member] | Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	128,745	141,844
Ratio of type of loan to total loans receivable	1.70%	1.80%
Non-Acquired Loans [Member] | Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	741,870	710,140
Ratio of type of loan to total loans receivable	9.50%	9.00%
Non-Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	398,130	319,210
Ratio of type of loan to total loans receivable	5.10%	4.10%
Non-Acquired Loans [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	239,469	162,823
Ratio of type of loan to total loans receivable	3.10%	2.10%
Non-Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	111,418	112,902
Ratio of type of loan to total loans receivable	1.40%	1.40%
Non-Acquired Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	51,515	63,374
Ratio of type of loan to total loans receivable	0.70%	0.80%
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	302,065	0
Ratio of type of loan to total loans receivable	3.80%	0.00%
Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	15,354	0
Ratio of type of loan to total loans receivable	0.20%	0.00%
Acquired Loans [Member] | Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	0	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	0	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	3,720	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	3,615	0
Ratio of type of loan to total loans receivable	0.10%	0.00%
Acquired Loans [Member] | Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	7,383	0
Ratio of type of loan to total loans receivable	0.10%	0.00%
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	162,724	0
Ratio of type of loan to total loans receivable	2.10%	0.00%
Acquired Loans [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	88,768	0
Ratio of type of loan to total loans receivable	1.10%	0.00%
Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	11,466	0
Ratio of type of loan to total loans receivable	0.10%	0.00%
Acquired Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	9,035	0
Ratio of type of loan to total loans receivable	0.10%	0.00%
Credit Impaired Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	102,038	111,117
Ratio of type of loan to total loans receivable	1.40%	1.40%
Credit Impaired Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	335	342
Ratio of type of loan to total loans receivable	0.00%	0.00%
Credit Impaired Acquired Loans [Member] | Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	0	1,889
Ratio of type of loan to total loans receivable	0.00%	0.00%
Credit Impaired Acquired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	2,484	3,702
Ratio of type of loan to total loans receivable	0.00%	0.10%
Credit Impaired Acquired Loans [Member] | Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	0	601
Ratio of type of loan to total loans receivable	0.00%	0.00%
Credit Impaired Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	78,519	87,154
Ratio of type of loan to total loans receivable	1.10%	1.10%
Credit Impaired Acquired Loans [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	8,606	3,292
Ratio of type of loan to total loans receivable	0.10%	0.00%
Credit Impaired Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	12,015	14,040
Ratio of type of loan to total loans receivable	0.20%	0.20%
Credit Impaired Acquired Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 79	$ 97
Ratio of type of loan to total loans receivable	0.00%	0.00%

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Discount on Acquired Loans

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Loans and Leases Receivable, Charges to Allowance, Loans in Process and Deferred Fees

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