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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, 2015	Sep. 30, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 363,216	$ 435,185
Unpaid Principal Balance	393,993	470,190
Related Allowance	8,057	10,587
Average Recorded Investment	363,891	403,138
Amount of related allowance included in specific reserves		60
Amount of related allowance included in general reserves		10,527
Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	41,982	46,680
Unpaid Principal Balance	64,774	73,123
Related Allowance	0	0
Average Recorded Investment	41,085	37,474
Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	321,234	388,505
Unpaid Principal Balance	329,219	397,067
Related Allowance	8,057	10,587
Average Recorded Investment	322,806	365,664
Single-Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	296,703	346,364
Unpaid Principal Balance	303,194	354,497
Related Allowance	8,057	10,527
Average Recorded Investment	296,613	333,191
Single-Family Residential [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	21,524	24,044
Unpaid Principal Balance	24,151	26,628
Related Allowance	0	0
Average Recorded Investment	20,724	16,843
Single-Family Residential [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	275,179	322,320
Unpaid Principal Balance	279,043	327,869
Related Allowance	8,057	10,527
Average Recorded Investment	275,889	316,348
Construction - Speculative [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,984	9,159
Unpaid Principal Balance	7,969	10,159
Related Allowance	0	60
Average Recorded Investment	7,004	9,336
Construction - Speculative [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	613	1,603
Unpaid Principal Balance	808	2,173
Related Allowance	0	0
Average Recorded Investment	615	1,804
Construction - Speculative [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,371	7,556
Unpaid Principal Balance	7,161	7,986
Related Allowance	0	60
Average Recorded Investment	6,389	7,532
Construction - Custom [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	355
Unpaid Principal Balance	355
Related Allowance	0
Average Recorded Investment	178
Construction - Custom [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	355
Unpaid Principal Balance	355
Related Allowance	0
Average Recorded Investment	178
Construction - Custom [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Land - Acquisition & Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,216	5,533
Unpaid Principal Balance	5,699	7,961
Related Allowance	0	0
Average Recorded Investment	4,254	5,152
Land - Acquisition & Development [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	680	837
Unpaid Principal Balance	1,223	2,325
Related Allowance	0	0
Average Recorded Investment	683	1,038
Land - Acquisition & Development [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,536	4,696
Unpaid Principal Balance	4,476	5,636
Related Allowance	0	0
Average Recorded Investment	3,571	4,114
Land - Consumer Lot Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,641	13,976
Unpaid Principal Balance	12,992	14,457
Related Allowance	0	0
Average Recorded Investment	12,596	13,571
Land - Consumer Lot Loans [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,101	974
Unpaid Principal Balance	1,187	1,072
Related Allowance	0	0
Average Recorded Investment	969	713
Land - Consumer Lot Loans [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,540	13,002
Unpaid Principal Balance	11,805	13,385
Related Allowance	0	0
Average Recorded Investment	11,627	12,858
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,374	6,354
Unpaid Principal Balance	5,374	6,574
Related Allowance	0	0
Average Recorded Investment	4,991	5,284
Multi-Family [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,531	1,111
Unpaid Principal Balance	1,531	1,111
Related Allowance	0	0
Average Recorded Investment	1,138	327
Multi-Family [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,843	5,243
Unpaid Principal Balance	3,843	5,463
Related Allowance	0	0
Average Recorded Investment	3,853	4,957
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	29,667	47,393
Unpaid Principal Balance	36,003	55,113
Related Allowance	0	0
Average Recorded Investment	29,757	30,292
Commercial Real Estate [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,416	13,234
Unpaid Principal Balance	14,797	20,085
Related Allowance	0	0
Average Recorded Investment	9,795	11,720
Commercial Real Estate [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	19,251	34,159
Unpaid Principal Balance	21,206	35,028
Related Allowance	0	0
Average Recorded Investment	19,962	18,572
Commercial & Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,340	3,195
Unpaid Principal Balance	18,276	17,166
Related Allowance	0	0
Average Recorded Investment	5,664	3,900
Commercial & Industrial [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,340	3,195
Unpaid Principal Balance	18,276	17,166
Related Allowance	0	0
Average Recorded Investment	5,664	3,900
Commercial & Industrial [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
HELOC [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,402	2,505
Unpaid Principal Balance	3,213	3,216
Related Allowance	0	0
Average Recorded Investment	2,299	1,816
HELOC [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,008	1,019
Unpaid Principal Balance	1,819	1,730
Related Allowance	0	0
Average Recorded Investment	905	612
HELOC [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,394	1,486
Unpaid Principal Balance	1,394	1,486
Related Allowance	0	0
Average Recorded Investment	1,394	1,204
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	534	706
Unpaid Principal Balance	918	1,047
Related Allowance	0	0
Average Recorded Investment	535	596
Consumer [Member] | Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	414	663
Unpaid Principal Balance	627	833
Related Allowance	0	0
Average Recorded Investment	414	517
Consumer [Member] | Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	120	43
Unpaid Principal Balance	291	214
Related Allowance	0	0
Average Recorded Investment	$ 121	$ 79

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



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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)



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+ References

Reference 1: 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



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