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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,950,608	$ 9,823,270
Nonaccrual loans by portfolio segment	42,414	67,810
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,658,827
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,110,411
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	473,069
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	118,497
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	104,568
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,124,289
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,093,639
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	978,589
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	149,717
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	139,002
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,673,989	$ 9,426,177
Grade as percentage of total gross assets	99.60%	99.30%
Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,587,919	$ 5,592,771
Grade as percentage of total gross assets	99.40%	99.00%
Performing Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,110,411	$ 199,755
Grade as percentage of total gross assets	100.00%	99.60%
Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 473,069	$ 395,575
Grade as percentage of total gross assets	100.00%	99.80%
Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 116,097	$ 94,208
Grade as percentage of total gross assets	99.90%	100.00%
Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 101,343	$ 102,716
Grade as percentage of total gross assets	99.50%	98.80%
Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,118,025	$ 1,123,165
Grade as percentage of total gross assets	99.90%	99.80%
Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 949,064	$ 984,093
Grade as percentage of total gross assets	99.30%	99.80%
Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 946,065	$ 612,836
Grade as percentage of total gross assets	99.90%	100.00%
Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 134,546	$ 127,083
Grade as percentage of total gross assets	99.80%	99.60%
Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 137,450	$ 193,975
Grade as percentage of total gross assets	100.00%	99.70%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 71,441	$ 128,908
Nonaccrual loans by portfolio segment	$ 42,414	$ 67,810
Percentage of total gross loans	0.40%	0.70%
Non-Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 33,148	$ 59,074
Percentage of total gross loans	0.60%	1.00%
Non-Performing Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 754
Percentage of total gross loans	0.00%	0.40%
Non-Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 732
Percentage of total gross loans	0.00%	0.20%
Non-Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 58	$ 0
Percentage of total gross loans	0.10%	0.00%
Non-Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 510	$ 1,273
Percentage of total gross loans	0.50%	1.20%
Non-Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 776	$ 2,558
Percentage of total gross loans	0.10%	0.20%
Non-Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 7,100	$ 2,176
Percentage of total gross loans	0.70%	0.20%
Non-Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 583	$ 0
Percentage of total gross loans	0.10%	0.00%
Non-Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 239	$ 563
Percentage of total gross loans	0.20%	0.40%
Non-Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 680
Percentage of total gross loans	0.00%	0.30%

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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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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