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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 9,823,270	$ 8,882,920
Nonaccrual loans by portfolio segment	67,810	87,431
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,700,782
Nonaccrual loans by portfolio segment	59,074	74,067
Construction - speculative
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	200,508
Nonaccrual loans by portfolio segment	754	1,477
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	396,309
Nonaccrual loans by portfolio segment	732	0
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	98,282
Nonaccrual loans by portfolio segment	0	811
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	106,813
Nonaccrual loans by portfolio segment	1,273	2,637
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,129,437
Nonaccrual loans by portfolio segment	2,558	1,742
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,186,551
Nonaccrual loans by portfolio segment	2,176	5,106
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 657,580
Nonaccrual loans by portfolio segment		7
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 149,527
Nonaccrual loans by portfolio segment	563	795
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	197,481
Nonaccrual loans by portfolio segment	680	789
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 9,426,177	$ 8,321,591
Grade as percentage of total gross assets	99.30%	99.00%
Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,592,771	$ 5,486,136
Grade as percentage of total gross assets	99.00%	98.70%
Performing Loans | Construction - speculative
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 199,755	$ 138,583
Grade as percentage of total gross assets	99.60%	98.90%
Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 395,575	$ 385,824
Grade as percentage of total gross assets	99.80%	100.00%
Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 94,208	$ 77,021
Grade as percentage of total gross assets	100.00%	99.00%
Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 102,716	$ 105,986
Grade as percentage of total gross assets	98.80%	97.60%
Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,123,165	$ 915,544
Grade as percentage of total gross assets	99.80%	99.80%
Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 984,093	$ 586,230
Grade as percentage of total gross assets	99.80%	99.10%
Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 612,836	$ 379,219
Grade as percentage of total gross assets	100.00%	100.00%
Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 127,083	$ 115,247
Grade as percentage of total gross assets	99.60%	99.30%
Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 193,975	$ 131,801
Grade as percentage of total gross assets	99.70%	99.40%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 128,577	$ 147,311
Nonaccrual loans by portfolio segment	$ 67,810	$ 87,431
Percentage of total gross loans	0.70%	1.00%
Non-Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 59,074	$ 74,067
Percentage of total gross loans	1.00%	1.30%
Non-Performing Loans | Construction - speculative
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 754	$ 1,477
Percentage of total gross loans	0.40%	1.10%
Non-Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 732	$ 0
Percentage of total gross loans	0.20%	0.00%
Non-Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 811
Percentage of total gross loans	0.00%	1.00%
Non-Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,273	$ 2,637
Percentage of total gross loans	1.20%	2.40%
Non-Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 2,558	$ 1,742
Percentage of total gross loans	0.20%	0.20%
Non-Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 2,176	$ 5,106
Percentage of total gross loans	0.20%	0.90%
Non-Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 7
Percentage of total gross loans	0.00%	0.00%
Non-Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 563	$ 795
Percentage of total gross loans	0.40%	0.70%
Non-Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 680	$ 789
Percentage of total gross loans	0.30%	0.60%

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Topic 310



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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 310



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Grade as Percentage of Total Gross Loans

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