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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 11,640,489	$ 10,950,608
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 11,379,052	$ 10,673,989
Total grade as a % of total net loans	99.50%	99.60%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 79,738	$ 71,441
Nonaccrual loans by portfolio segment	$ 57,195	$ 42,414
Grade as a percentage of total gross loans	0.50%	0.40%
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,693,072	$ 5,658,830
Single-family residential | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,626,725	$ 5,587,919
Total grade as a % of total net loans	99.40%	99.40%
Single-family residential | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 34,373	$ 33,148
Grade as a percentage of total gross loans	0.60%	0.60%
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,311,635	$ 1,110,411
Construction | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,311,636	$ 1,110,411
Total grade as a % of total net loans	100.00%	100.00%
Construction | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 0
Grade as a percentage of total gross loans	0.00%	0.00%
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 527,319	$ 473,069
Construction - custom | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 527,079	$ 473,069
Total grade as a % of total net loans	100.00%	100.00%
Construction - custom | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 240	$ 0
Grade as a percentage of total gross loans	0.00%	0.00%
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 118,726	$ 118,497
Land - acquisition & development | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 116,857	$ 116,097
Total grade as a % of total net loans	99.90%	99.90%
Land - acquisition & development | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 80	$ 58
Grade as a percentage of total gross loans	0.10%	0.10%
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 101,227	$ 104,567
Land - consumer lot loans | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 97,537	$ 101,343
Total grade as a % of total net loans	98.90%	99.50%
Land - consumer lot loans | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,129	$ 510
Grade as a percentage of total gross loans	1.10%	0.50%
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,266,911	$ 1,124,290
Multi-family | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,263,004	$ 1,118,025
Total grade as a % of total net loans	99.90%	99.90%
Multi-family | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,364	$ 776
Grade as a percentage of total gross loans	0.10%	0.10%
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,296,039	$ 1,093,639
Commercial real estate | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,173,483	$ 949,064
Total grade as a % of total net loans	99.10%	99.30%
Commercial real estate | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 10,507	$ 7,100
Grade as a percentage of total gross loans	0.90%	0.70%
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,071,629	$ 978,589
Commercial & industrial | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,021,889	$ 946,065
Total grade as a % of total net loans	99.10%	99.90%
Commercial & industrial | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 8,864	$ 583
Grade as a percentage of total gross loans	0.90%	0.10%
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 146,172	$ 149,716
HELOC | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 134,376	$ 134,546
Total grade as a % of total net loans	99.60%	99.80%
HELOC | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 583	$ 239
Grade as a percentage of total gross loans	0.40%	0.20%
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 107,759	$ 139,000
Consumer | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 106,466	$ 137,450
Total grade as a % of total net loans	99.90%	100.00%
Consumer | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 55	$ 0
Grade as a percentage of total gross loans	0.10%	0.00%

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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
-Paragraph 2
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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