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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 111,016	$ 109,919	$ 106,829	$ 105,611	$ 108,323	$ 114,591
Loans receivable, gross	10,572,201		9,823,270
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	40,681	41,828	47,347	52,004	54,762	62,763
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	17,662	15,726	6,680	5,933	5,445	6,742
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,028	1,022	990	985	968	1,695
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,722	7,252	5,781	5,772	7,405	5,592
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,504	2,466	2,946	2,999	3,035	3,077
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,921	6,784	5,304	5,035	4,673	4,248
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	8,143	7,783	8,960	7,268	6,734	7,548
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	24,396	23,824	24,980	21,662	21,146	16,527
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	856	828	902	864	850	928
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,103	$ 2,406	2,939	$ 3,089	$ 3,305	$ 3,227
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	110,119		106,554
Loans receivable, gross	$ 9,438,408		$ 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 loan losses	$ 39,986		$ 47,073
Loans receivable, gross	$ 5,547,373		$ 5,595,752
Ratio	0.70%		0.80%
Loans Collectively Evaluated for Impairment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 17,662		$ 6,680
Loans receivable, gross	$ 442,437		$ 124,679
Ratio	4.00%		5.40%
Loans Collectively Evaluated for Impairment | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,027		$ 990
Loans receivable, gross	$ 211,215		$ 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 loan losses	$ 6,710		$ 5,781
Loans receivable, gross	$ 87,099		$ 72,602
Ratio	7.70%		8.00%
Loans Collectively Evaluated for Impairment | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2,504		$ 2,946
Loans receivable, gross	$ 90,983		$ 93,103
Ratio	2.80%		3.20%
Loans Collectively Evaluated for Impairment | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 6,911		$ 5,304
Loans receivable, gross	$ 1,091,709		$ 1,062,194
Ratio	0.60%		0.50%
Loans Collectively Evaluated for Impairment | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 7,963		$ 8,960
Loans receivable, gross	$ 848,187		$ 844,691
Ratio	0.90%		1.10%
Loans Collectively Evaluated for Impairment | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 24,397		$ 24,980
Loans receivable, gross	$ 832,429		$ 643,577
Ratio	2.90%		3.90%
Loans Collectively Evaluated for Impairment | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 856		$ 902
Loans receivable, gross	$ 132,869		$ 126,594
Ratio	0.60%		0.70%
Loans Collectively Evaluated for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2,103		$ 2,938
Loans receivable, gross	$ 154,107		$ 194,569
Ratio	1.40%		1.50%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 897		$ 275
Loans receivable, gross	$ 51,562		$ 85,513
Ratio	1.70%		0.30%
Loans Individually Evaluated for Impairment | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 693		$ 275
Loans receivable, gross	$ 24,451		$ 51,718
Ratio	2.80%		0.50%
Loans Individually Evaluated for Impairment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan 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 loan losses	$ 0		$ 0
Loans receivable, gross	$ 1,125		$ 0
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 13		$ 0
Loans receivable, gross	$ 1,454		$ 2,198
Ratio	0.90%		0.00%
Loans Individually Evaluated for Impairment | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 1,238		$ 10,824
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 11		$ 0
Loans receivable, gross	$ 1,513		$ 5,348
Ratio	0.70%		0.00%
Loans Individually Evaluated for Impairment | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 180		$ 0
Loans receivable, gross	$ 21,313		$ 8,826
Ratio	0.80%		0.00%
Loans Individually Evaluated for Impairment | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 0		$ 0
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 468		$ 1,072
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 0		$ 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
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 45
-Paragraph 2
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