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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 12,540,254	$ 12,201,387
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 12,486,446	$ 12,151,807
Total grade as a % of total net loans	99.60%	99.60%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 69,712	$ 70,238
Nonaccrual loans by portfolio segment	$ 53,808	$ 49,580
Grade as a percentage of total gross loans	0.40%	0.40%
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,705,350	$ 5,711,004
Single-family residential | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,680,031	$ 5,683,074
Total grade as a % of total net loans	99.60%	99.50%
Single-family residential | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 25,319	$ 27,930
Grade as a percentage of total gross loans	0.40%	0.50%
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,732,202	$ 1,597,996
Construction | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,729,906	$ 1,597,996
Total grade as a % of total net loans	99.90%	100.00%
Construction | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 2,296	$ 0
Grade as a percentage of total gross loans	0.10%	0.00%
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 597,671	$ 602,631
Construction - custom | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 597,671	$ 602,540
Total grade as a % of total net loans	100.00%	99.90%
Construction - custom | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 91
Grade as a percentage of total gross loans	0.00%	0.10%
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 141,628	$ 124,308
Land - acquisition & development | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 139,624	$ 124,012
Total grade as a % of total net loans	98.60%	99.80%
Land - acquisition & development | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 2,004	$ 296
Grade as a percentage of total gross loans	1.40%	0.20%
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 102,779	$ 104,405
Land - consumer lot loans | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 101,734	$ 103,800
Total grade as a % of total net loans	99.00%	99.40%
Land - consumer lot loans | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,045	$ 605
Grade as a percentage of total gross loans	1.00%	0.60%
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,328,049	$ 1,303,148
Multi-family | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,328,049	$ 1,303,009
Total grade as a % of total net loans	100.00%	99.90%
Multi-family | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 139
Grade as a percentage of total gross loans	0.00%	0.10%
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,443,437	$ 1,434,610
Commercial real estate | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,433,910	$ 1,422,795
Total grade as a % of total net loans	99.30%	99.20%
Commercial real estate | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 9,527	$ 11,815
Grade as a percentage of total gross loans	0.70%	0.80%
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,151,108	$ 1,093,360
Commercial & industrial | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,137,746	$ 1,085,278
Total grade as a % of total net loans	98.80%	99.30%
Commercial & industrial | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 13,362	$ 8,082
Grade as a percentage of total gross loans	1.20%	0.70%
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 135,119	$ 144,850
HELOC | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 134,902	$ 144,319
Total grade as a % of total net loans	99.80%	99.60%
HELOC | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 217	$ 531
Grade as a percentage of total gross loans	0.20%	0.40%
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 202,911	$ 85,075
Consumer | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 202,873	$ 84,984
Total grade as a % of total net loans	100.00%	99.90%
Consumer | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 38	$ 91
Grade as a percentage of total gross loans	0.00%	0.10%

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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
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-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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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