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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 107,901	$ 106,829	$ 114,591
Loans receivable, gross	10,110,184	9,823,270
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	47,756	47,347	62,763
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	7,014	6,680	6,742
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	1,062	990	1,695
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	6,778	5,781	5,592
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	3,001	2,946	3,077
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	5,047	5,304	4,248
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	10,344	8,960	7,548
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	24,096	24,980	16,527
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	820	902	928
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	1,983	2,939	$ 3,227
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	107,771	106,554
Loans receivable, gross	$ 9,232,046	$ 8,963,453
Ratio	1.20%	1.20%
Loans Collectively Evaluated for Impairment | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 47,625	$ 47,073
Loans receivable, gross	$ 5,614,580	$ 5,595,752
Ratio	0.80%	0.80%
Loans Collectively Evaluated for Impairment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 7,014	$ 6,680
Loans receivable, gross	$ 121,689	$ 124,679
Ratio	5.80%	5.40%
Loans Collectively Evaluated for Impairment | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 1,062	$ 990
Loans receivable, gross	$ 218,749	$ 205,692
Ratio	0.50%	0.50%
Loans Collectively Evaluated for Impairment | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 6,778	$ 5,781
Loans receivable, gross	$ 77,223	$ 72,602
Ratio	8.80%	8.00%
Loans Collectively Evaluated for Impairment | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 3,001	$ 2,946
Loans receivable, gross	$ 91,664	$ 93,103
Ratio	3.30%	3.20%
Loans Collectively Evaluated for Impairment | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 5,048	$ 5,304
Loans receivable, gross	$ 1,085,243	$ 1,062,194
Ratio	0.50%	0.50%
Loans Collectively Evaluated for Impairment | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 10,344	$ 8,960
Loans receivable, gross	$ 939,248	$ 844,691
Ratio	1.10%	1.10%
Loans Collectively Evaluated for Impairment | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 24,096	$ 24,980
Loans receivable, gross	$ 776,240	$ 643,577
Ratio	3.10%	3.90%
Loans Collectively Evaluated for Impairment | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 820	$ 902
Loans receivable, gross	$ 126,596	$ 126,594
Ratio	0.60%	0.70%
Loans Collectively Evaluated for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 1,983	$ 2,938
Loans receivable, gross	$ 180,814	$ 194,569
Ratio	1.10%	1.50%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 130	$ 275
Loans receivable, gross	$ 49,067	$ 85,513
Ratio	0.30%	0.30%
Loans Individually Evaluated for Impairment | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 130	$ 275
Loans receivable, gross	$ 14,206	$ 51,718
Ratio	0.90%	0.50%
Loans Individually Evaluated for Impairment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 0	$ 5,441
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 2,578	$ 0
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 6,649	$ 2,198
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 10,658	$ 10,824
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 3,500	$ 5,348
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 9,811	$ 8,826
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 27	$ 0
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 1,310	$ 1,072
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0	$ 0
Loans receivable, gross	$ 328	$ 86
Ratio	0.00%	0.00%

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

+ 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 (c)(1)
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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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Allowance as a Percentage of Outstanding Loans and Leases

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