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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, 2016	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 276,538	$ 341,579
Unpaid Principal Balance	308,894	381,223
Related Allowance	4,406	6,678
Average Recorded Investment	275,273	333,815
Amount of related allowance included in specific reserves	897	275
Amount of related allowance included in general reserves	3,509	6,403
Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	18,402	38,866
Unpaid Principal Balance	40,363	70,564
Related Allowance	0	0
Average Recorded Investment	16,891	29,474
Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	258,136	302,713
Unpaid Principal Balance	268,531	310,659
Related Allowance	4,406	6,678
Average Recorded Investment	258,382	304,341
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	233,135	276,711
Unpaid Principal Balance	238,920	282,912
Related Allowance	4,202	6,678
Average Recorded Investment	232,765	274,097
Single-family residential | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,602	17,250
Unpaid Principal Balance	11,287	19,644
Related Allowance	0	0
Average Recorded Investment	8,491	14,069
Single-family residential | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	223,533	259,461
Unpaid Principal Balance	227,633	263,268
Related Allowance	4,202	6,678
Average Recorded Investment	224,274	260,028
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment		5,441
Unpaid Principal Balance		7,929
Related Allowance		0
Average Recorded Investment		5,903
Construction | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment		453
Unpaid Principal Balance		2,151
Related Allowance		0
Average Recorded Investment		471
Construction | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment		4,988
Unpaid Principal Balance		5,778
Related Allowance		0
Average Recorded Investment		5,432
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded Investment	578	554
Unpaid Principal Balance	578	554
Related Allowance	0	0
Average Recorded Investment	289	182
Construction - custom | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	578	554
Unpaid Principal Balance	578	554
Related Allowance	0	0
Average Recorded Investment	289	182
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,618	5,056
Unpaid Principal Balance	11,049	12,852
Related Allowance	8	0
Average Recorded Investment	1,707	4,404
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	164	2,570
Unpaid Principal Balance	8,393	9,426
Related Allowance	0	0
Average Recorded Investment	164	926
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,454	2,486
Unpaid Principal Balance	2,656	3,426
Related Allowance	8	0
Average Recorded Investment	1,543	3,478
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,322	12,016
Unpaid Principal Balance	11,481	12,368
Related Allowance	5	0
Average Recorded Investment	10,347	11,868
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	650	727
Unpaid Principal Balance	747	814
Related Allowance	0	0
Average Recorded Investment	599	544
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,672	11,289
Unpaid Principal Balance	10,734	11,554
Related Allowance	5	0
Average Recorded Investment	9,748	11,324
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,941	7,593
Unpaid Principal Balance	5,690	10,877
Related Allowance	11	0
Average Recorded Investment	2,254	5,277
Multi-family | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	428	3,770
Unpaid Principal Balance	4,177	7,054
Related Allowance	0	0
Average Recorded Investment	736	1,545
Multi-family | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,513	3,823
Unpaid Principal Balance	1,513	3,823
Related Allowance	11	0
Average Recorded Investment	1,518	3,732
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	26,163	28,551
Unpaid Principal Balance	30,904	36,698
Related Allowance	180	0
Average Recorded Investment	25,513	27,016
Commercial real estate | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,673	9,427
Unpaid Principal Balance	6,588	15,620
Related Allowance	0	0
Average Recorded Investment	5,697	8,130
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	20,490	19,124
Unpaid Principal Balance	24,316	21,078
Related Allowance	180	0
Average Recorded Investment	19,816	18,886
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	906	2,955
Unpaid Principal Balance	7,627	13,066
Related Allowance	0	0
Average Recorded Investment	544	2,681
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	906	2,955
Unpaid Principal Balance	7,627	13,066
Related Allowance	0	0
Average Recorded Investment	544	2,681
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,747	2,126
Unpaid Principal Balance	1,877	2,975
Related Allowance	0	0
Average Recorded Investment	1,742	1,895
HELOC | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	368	683
Unpaid Principal Balance	483	1,532
Related Allowance	0	0
Average Recorded Investment	354	536
HELOC | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,379	1,443
Unpaid Principal Balance	1,394	1,443
Related Allowance	0	0
Average Recorded Investment	1,388	1,359
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	128	576
Unpaid Principal Balance	768	992
Related Allowance	0	0
Average Recorded Investment	112	492
Consumer | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	33	477
Unpaid Principal Balance	483	703
Related Allowance	0	0
Average Recorded Investment	17	390
Consumer | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	95	99
Unpaid Principal Balance	285	289
Related Allowance	0	0
Average Recorded Investment	$ 95	$ 102

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=49124121&loc=SL6953423-111524

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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=49124121&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=49124121&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 17
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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)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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