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Loans Receivable (excluding Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 7,830,112	$ 7,866,336
Ratio of type of loan to total loans receivable	100.00%	100.00%
Allowance for probable losses	122,884	133,147	126,827	157,160
Loans in process	189,336	213,286
Discount on acquired loans	40,346	33,484
Deferred net origination fees	33,330	34,421
Charges against loans receivable	385,896	414,338
Loans receivable, net	7,444,216	7,451,998
Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,390,743	5,779,264
Ratio of type of loan to total loans receivable	68.80%	73.50%
Allowance for probable losses	77,422	81,815	77,508	83,307
Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	122,544	131,526
Ratio of type of loan to total loans receivable	1.50%	1.70%
Allowance for probable losses	7,757	12,060	8,660	13,828
Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	217,349	211,690
Ratio of type of loan to total loans receivable	2.80%	2.70%
Allowance for probable losses	262	347	275	623
Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	99,509	128,379
Ratio of type of loan to total loans receivable	1.20%	1.60%
Allowance for probable losses	12,221	15,598	15,056	32,719
Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	133,875	141,844
Ratio of type of loan to total loans receivable	1.80%	1.80%
Allowance for probable losses	3,941	4,937	4,963	5,520
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	733,036	710,741
Ratio of type of loan to total loans receivable	9.50%	9.00%
Allowance for probable losses	4,272	5,280	5,107	7,623
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	642,556	406,364
Ratio of type of loan to total loans receivable	8.10%	5.20%
Allowance for probable losses	4,156	1,956	2,651	4,331
Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	288,944	166,115
Ratio of type of loan to total loans receivable	3.70%	2.10%
Allowance for probable losses	8,628	7,626	8,062	5,099
HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	137,473	126,942
Ratio of type of loan to total loans receivable	1.80%	1.60%
Allowance for probable losses	1,031	965	1,044	1,139
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	64,083	63,471
Ratio of type of loan to total loans receivable	0.80%	0.80%
Allowance for probable losses	3,194	2,563	3,501	2,971
Non-Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	7,403,267	7,755,219
Ratio of type of loan to total loans receivable	94.50%	98.60%
Non-Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,374,977	5,778,922
Ratio of type of loan to total loans receivable	68.60%	73.50%
Non-Acquired Loans [Member] | Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	120,617	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	217,036	211,690
Ratio of type of loan to total loans receivable	2.80%	2.70%
Non-Acquired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	93,496	124,677
Ratio of type of loan to total loans receivable	1.20%	1.60%
Non-Acquired Loans [Member] | Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	130,056	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	725,322	710,140
Ratio of type of loan to total loans receivable	9.30%	9.00%
Non-Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	385,587	319,210
Ratio of type of loan to total loans receivable	4.90%	4.10%
Non-Acquired Loans [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	190,598	162,823
Ratio of type of loan to total loans receivable	2.40%	2.10%
Non-Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	111,622	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	53,956	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	327,383	0
Ratio of type of loan to total loans receivable	4.20%	0.00%
Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	15,428	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	177	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	313	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	3,436	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	3,819	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	7,714	0
Ratio of type of loan to total loans receivable	0.20%	0.00%
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	177,101	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	96,255	0
Ratio of type of loan to total loans receivable	1.30%	0.00%
Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	13,094	0
Ratio of type of loan to total loans receivable	0.20%	0.00%
Acquired Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	10,046	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	99,462	111,117
Ratio of type of loan to total loans receivable	1.30%	1.40%
Credit Impaired Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	338	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	1,750	1,889
Ratio of type of loan to total loans receivable	0.00%	0.10%
Credit Impaired Acquired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	2,577	3,702
Ratio of type of loan to total loans receivable	0.00%	0.00%
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	79,868	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	2,091	3,292
Ratio of type of loan to total loans receivable	0.00%	0.00%
Credit Impaired Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	12,757	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	$ 81	$ 97
Ratio of type of loan to total loans receivable	0.00%	0.00%

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A valuation allowance for financing receivables that are expected to be uncollectible.

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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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