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Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 129,257	$ 123,073	$ 113,494
Recorded Investment of Loans	12,853,678	12,201,387
Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	33,033	36,892	37,796
Recorded Investment of Loans	5,798,966	5,711,004
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	31,317	24,556	19,838
Recorded Investment of Loans	1,890,668	1,597,996
Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	1,842	1,944	1,080
Recorded Investment of Loans	624,479	602,631
Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	7,978	6,829	6,023
Recorded Investment of Loans	155,204	124,308
Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	2,164	2,649	2,535
Recorded Investment of Loans	102,036	104,405
Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	8,329	7,862	6,925
Recorded Investment of Loans	1,385,125	1,303,148
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	11,852	11,818	8,588
Recorded Investment of Loans	1,452,168	1,434,610
Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	28,702	28,524	28,008
Recorded Investment of Loans	1,140,874	1,093,360
HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	781	855	813
Recorded Investment of Loans	130,852	144,850
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	3,259	1,144	$ 1,888
Recorded Investment of Loans	173,306	85,075
Loans Collectively Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	128,740	122,947
Recorded Investment of Loans	$ 11,597,492	$ 11,000,212
Ratio	1.10%	1.10%
Loans Collectively Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 33,033	$ 36,892
Recorded Investment of Loans	$ 5,782,870	$ 5,713,576
Ratio	0.60%	0.70%
Loans Collectively Evaluated for Impairment | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 31,317	$ 24,556
Recorded Investment of Loans	$ 1,060,428	$ 793,958
Ratio	3.00%	3.10%
Loans Collectively Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 1,842	$ 1,944
Recorded Investment of Loans	$ 289,192	$ 277,495
Ratio	0.60%	0.70%
Loans Collectively Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 7,969	$ 6,828
Recorded Investment of Loans	$ 122,639	$ 104,767
Ratio	6.50%	6.50%
Loans Collectively Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 2,164	$ 2,649
Recorded Investment of Loans	$ 96,583	$ 96,337
Ratio	2.20%	2.80%
Loans Collectively Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 8,325	$ 7,857
Recorded Investment of Loans	$ 1,384,655	$ 1,302,625
Ratio	0.60%	0.60%
Loans Collectively Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 11,702	$ 11,698
Recorded Investment of Loans	$ 1,432,791	$ 1,391,668
Ratio	0.80%	0.80%
Loans Collectively Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 28,348	$ 28,524
Recorded Investment of Loans	$ 1,126,438	$ 1,093,210
Ratio	2.50%	2.60%
Loans Collectively Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 781	$ 855
Recorded Investment of Loans	$ 128,715	$ 141,689
Ratio	0.60%	0.60%
Loans Collectively Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 3,259	$ 1,144
Recorded Investment of Loans	$ 173,181	$ 84,887
Ratio	1.90%	1.40%
Loans Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 517	$ 126
Recorded Investment of Loans	$ 60,680	$ 28,553
Ratio	0.90%	0.40%
Loans Individually Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 21,345	$ 5,552
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 2,427	$ 0
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 0	$ 105
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 9	$ 1
Recorded Investment of Loans	$ 920	$ 89
Ratio	1.00%	1.00%
Loans Individually Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 507	$ 171
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 4	$ 5
Recorded Investment of Loans	$ 448	$ 493
Ratio	1.00%	1.00%
Loans Individually Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 150	$ 120
Recorded Investment of Loans	$ 19,378	$ 21,765
Ratio	0.80%	0.60%
Loans Individually Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 354	$ 0
Recorded Investment of Loans	$ 14,437	$ 81
Ratio	2.50%	0.00%
Loans Individually Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 1,162	$ 215
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 56	$ 82
Ratio	0.00%	0.00%

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

No definition available.

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- Definition

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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- Definition

Allowance as a Percentage of Outstanding Loans and Leases

+ References

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