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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 13,304,743	$ 12,853,678
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 13,198,720	$ 12,728,537
Total grade as a % of total gross loans	99.20%	99.03%
Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 6,912	$ 27,197
Total grade as a % of total gross loans	0.05%	0.21%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 97,836	$ 97,944
Total grade as a % of total gross loans	0.74%	0.76%
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,275	$ 0
Total grade as a % of total gross loans	0.01%	0.00%
Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Total grade as a % of total gross loans	0.00%	0.00%
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,873,583	$ 5,798,966
Single-family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,846,169	5,766,096
Single-family residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Single-family residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	27,414	32,870
Single-family residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Single-family residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,997,236	1,890,668
Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,997,236	1,886,304
Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	1,937
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	2,427
Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	570,897	624,479
Construction - custom | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	569,736	624,479
Construction - custom | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction - custom | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,161	0
Construction - custom | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction - custom | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	203,086	155,204
Land - acquisition & development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	199,241	152,984
Land - acquisition & development | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - acquisition & development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,845	2,220
Land - acquisition & development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - acquisition & development | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	95,227	102,036
Land - consumer lot loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	94,413	101,249
Land - consumer lot loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - consumer lot loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	814	787
Land - consumer lot loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - consumer lot loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,403,142	1,385,125
Multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,395,316	1,378,803
Multi-family | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	1,633
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,826	4,689
Multi-family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi-family | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,622,943	1,452,168
Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,590,337	1,421,602
Commercial real estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,771	7,114
Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	29,835	23,452
Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,256,398	1,140,874
Commercial & industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,224,843	1,093,405
Commercial & industrial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,141	16,513
Commercial & industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	26,139	30,956
Commercial & industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,275	0
Commercial & industrial | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	139,914	130,852
HELOC | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	139,112	130,330
HELOC | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
HELOC | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	802	522
HELOC | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
HELOC | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	142,317	173,306
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	142,317	173,285
Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	21
Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0

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+ References

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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