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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 269,943	$ 285,243
Unpaid Principal Balance	307,877	321,743
Related Allowance	4,900	3,915
Average Recorded Investment	262,726	265,771
Amount of related allowance included in specific reserves	139	366
Amount of related allowance included in general reserves	4,761	3,549
Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	46,385	23,712
Unpaid Principal Balance	77,423	50,196
Related Allowance	0	0
Average Recorded Investment	38,539	15,479
Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	223,558	261,531
Unpaid Principal Balance	230,454	271,547
Related Allowance	4,900	3,915
Average Recorded Investment	224,187	250,292
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	220,976	237,813
Unpaid Principal Balance	227,762	243,961
Related Allowance	4,761	3,809
Average Recorded Investment	214,422	223,143
Single-family residential | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	24,487	9,627
Unpaid Principal Balance	26,942	11,366
Related Allowance	0	0
Average Recorded Investment	17,683	6,511
Single-family residential | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	196,489	228,186
Unpaid Principal Balance	200,820	232,595
Related Allowance	4,761	3,809
Average Recorded Investment	196,739	216,632
Construction, custom
Financing Receivable, Impaired [Line Items]
Recorded Investment	711
Unpaid Principal Balance	715
Related Allowance	0
Average Recorded Investment	436
Construction, custom | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	711
Unpaid Principal Balance	715
Related Allowance	0
Average Recorded Investment	436
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	313	1,292
Unpaid Principal Balance	8,424	11,095
Related Allowance	2	1
Average Recorded Investment	360	2,380
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	123	138
Unpaid Principal Balance	8,234	9,001
Related Allowance	0	0
Average Recorded Investment	123	614
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	190	1,154
Unpaid Principal Balance	190	2,094
Related Allowance	2	1
Average Recorded Investment	237	1,766
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,049	10,129
Unpaid Principal Balance	9,874	11,287
Related Allowance	0	1
Average Recorded Investment	9,275	9,865
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	212	499
Unpaid Principal Balance	332	609
Related Allowance	0	0
Average Recorded Investment	214	317
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,837	9,630
Unpaid Principal Balance	9,542	10,678
Related Allowance	0	1
Average Recorded Investment	9,061	9,548
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,179	1,899
Unpaid Principal Balance	4,451	5,477
Related Allowance	4	13
Average Recorded Investment	1,420	2,160
Multi-family | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	682	394
Unpaid Principal Balance	3,954	3,972
Related Allowance	0	0
Average Recorded Investment	915	638
Multi-family | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	497	1,505
Unpaid Principal Balance	497	1,505
Related Allowance	4	13
Average Recorded Investment	505	1,522
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	27,278	31,175
Unpaid Principal Balance	37,230	44,149
Related Allowance	133	91
Average Recorded Investment	26,419	25,571
Commercial real estate | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,371	11,741
Unpaid Principal Balance	19,725	21,301
Related Allowance	0	0
Average Recorded Investment	10,417	6,260
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	15,907	19,434
Unpaid Principal Balance	17,505	22,848
Related Allowance	133	91
Average Recorded Investment	16,002	19,311
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,656	1,030
Unpaid Principal Balance	14,786	3,082
Related Allowance	0	0
Average Recorded Investment	8,567	863
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,529	1,030
Unpaid Principal Balance	14,659	3,082
Related Allowance	0	0
Average Recorded Investment	8,440	863
Commercial & industrial | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	127
Unpaid Principal Balance	127
Related Allowance	0
Average Recorded Investment	127
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,660	1,715
Unpaid Principal Balance	2,847	1,836
Related Allowance	0	0
Average Recorded Investment	1,688	1,578
HELOC | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	251	209
Unpaid Principal Balance	1,363	315
Related Allowance	0	0
Average Recorded Investment	277	165
HELOC | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,409	1,506
Unpaid Principal Balance	1,484	1,521
Related Allowance	0	0
Average Recorded Investment	1,411	1,413
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	121	190
Unpaid Principal Balance	1,788	856
Related Allowance	0	0
Average Recorded Investment	139	211
Consumer | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	19	74
Unpaid Principal Balance	1,499	550
Related Allowance	0	0
Average Recorded Investment	34	111
Consumer | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	102	116
Unpaid Principal Balance	289	306
Related Allowance	0	0
Average Recorded Investment	$ 105	$ 100

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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