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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 282,439	$ 285,243
Unpaid Principal Balance	321,859	321,743
Related Allowance	4,417	3,915
Average Recorded Investment	265,297	265,771
Amount of related allowance included in specific reserves	100	366
Amount of related allowance included in general reserves	4,317	3,549
Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	48,538	23,712
Unpaid Principal Balance	80,811	50,196
Related Allowance	0	0
Average Recorded Investment	33,613	15,479
Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	233,901	261,531
Unpaid Principal Balance	241,048	271,547
Related Allowance	4,417	3,915
Average Recorded Investment	231,684	250,292
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	230,883	237,813
Unpaid Principal Balance	237,672	243,961
Related Allowance	4,316	3,809
Average Recorded Investment	217,188	223,143
Single-family residential | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	25,928	9,627
Unpaid Principal Balance	28,378	11,366
Related Allowance	0	0
Average Recorded Investment	14,350	6,511
Single-family residential | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	204,955	228,186
Unpaid Principal Balance	209,294	232,595
Related Allowance	4,316	3,809
Average Recorded Investment	202,838	216,632
Construction, custom
Financing Receivable, Impaired [Line Items]
Recorded Investment	296
Unpaid Principal Balance	300
Related Allowance	0
Average Recorded Investment	99
Construction, custom | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	296
Unpaid Principal Balance	300
Related Allowance	0
Average Recorded Investment	99
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	717	1,292
Unpaid Principal Balance	8,940	11,095
Related Allowance	3	1
Average Recorded Investment	640	2,380
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	123	138
Unpaid Principal Balance	8,346	9,001
Related Allowance	0	0
Average Recorded Investment	130	614
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	594	1,154
Unpaid Principal Balance	594	2,094
Related Allowance	3	1
Average Recorded Investment	510	1,766
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,934	10,129
Unpaid Principal Balance	10,902	11,287
Related Allowance	0	1
Average Recorded Investment	9,814	9,865
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	524	499
Unpaid Principal Balance	587	609
Related Allowance	0	0
Average Recorded Investment	490	317
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,410	9,630
Unpaid Principal Balance	10,315	10,678
Related Allowance	0	1
Average Recorded Investment	9,324	9,548
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,495	1,899
Unpaid Principal Balance	6,035	5,477
Related Allowance	10	13
Average Recorded Investment	2,238	2,160
Multi-family | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,364	394
Unpaid Principal Balance	4,904	3,972
Related Allowance	0	0
Average Recorded Investment	1,100	638
Multi-family | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,131	1,505
Unpaid Principal Balance	1,131	1,505
Related Allowance	10	13
Average Recorded Investment	1,138	1,522
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	26,210	31,175
Unpaid Principal Balance	36,908	44,149
Related Allowance	88	91
Average Recorded Investment	26,673	25,571
Commercial real estate | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,920	11,741
Unpaid Principal Balance	18,978	21,301
Related Allowance	0	0
Average Recorded Investment	10,182	6,260
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	16,290	19,434
Unpaid Principal Balance	17,930	22,848
Related Allowance	88	91
Average Recorded Investment	16,491	19,311
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,606	1,030
Unpaid Principal Balance	16,096	3,082
Related Allowance	0	0
Average Recorded Investment	6,772	863
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,606	1,030
Unpaid Principal Balance	16,096	3,082
Related Allowance	0	0
Average Recorded Investment	6,772	863
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,132	1,715
Unpaid Principal Balance	3,343	1,836
Related Allowance	0	0
Average Recorded Investment	1,726	1,578
HELOC | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	718	209
Unpaid Principal Balance	1,856	315
Related Allowance	0	0
Average Recorded Investment	443	165
HELOC | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,414	1,506
Unpaid Principal Balance	1,487	1,521
Related Allowance	0	0
Average Recorded Investment	1,283	1,413
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	166	190
Unpaid Principal Balance	1,663	856
Related Allowance	0	0
Average Recorded Investment	147	211
Consumer | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	59	74
Unpaid Principal Balance	1,366	550
Related Allowance	0	0
Average Recorded Investment	47	111
Consumer | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	107	116
Unpaid Principal Balance	297	306
Related Allowance	0	0
Average Recorded Investment	$ 100	$ 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
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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

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-Publisher FASB
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+ References

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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+ 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

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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