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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 105,611	$ 108,323	$ 112,347	$ 114,150	$ 114,931	$ 116,741
Loans receivable, gross	9,256,701		8,669,717
Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	52,004	54,762	62,763	62,360	63,348	64,184
Loans receivable, gross	5,568,929		5,572,244
Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	5,933	5,445	6,742	6,387	6,773	8,407
Loans receivable, gross	181,668		140,060
Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	985	968	1,695	1,678	1,599	882
Loans receivable, gross	375,425		385,824
Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	5,772	7,405	5,592	6,955	6,027	9,165
Loans receivable, gross	90,252		80,359
Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	2,999	3,035	3,077	2,862	2,974	3,552
Loans receivable, gross	105,463		111,130
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	5,035	4,673	4,248	4,141	4,187	3,816
Loans receivable, gross	1,093,374		920,285
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	7,268	6,734	7,548	6,689	5,924	5,595
Loans receivable, gross	981,824		752,957
Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	21,662	21,146	16,527	18,696	20,403	16,614
Loans receivable, gross	512,973		434,088
HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	864	850	928	1,015	975	1,002
Loans receivable, gross	137,837		134,455
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	3,089	$ 3,305	3,227	$ 3,367	$ 2,721	$ 3,524
Loans receivable, gross	208,956		138,315
Loans Collectively Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	105,611		112,287
Loans receivable, gross	$ 8,478,557		$ 8,316,874
Ratio	1.30%		1.40%
Loans Collectively Evaluated for Impairment [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 52,004		$ 62,067
Loans receivable, gross	$ 5,497,635		$ 5,487,331
Ratio	1.00%		1.10%
Loans Collectively Evaluated for Impairment [Member] | Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 5,933		$ 6,682
Loans receivable, gross	$ 110,727		$ 130,901
Ratio	5.40%		5.50%
Loans Collectively Evaluated for Impairment [Member] | Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 985		$ 1,695
Loans receivable, gross	$ 204,914		$ 385,464
Ratio	0.50%		0.50%
Loans Collectively Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 5,772		$ 5,592
Loans receivable, gross	$ 68,234		$ 73,999
Ratio	8.50%		7.60%
Loans Collectively Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 2,999		$ 3,077
Loans receivable, gross	$ 91,392		$ 95,684
Ratio	3.30%		3.20%
Loans Collectively Evaluated for Impairment [Member] | Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 5,035		$ 4,248
Loans receivable, gross	$ 1,008,452		$ 911,162
Ratio	0.50%		0.50%
Loans Collectively Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 7,268		$ 7,548
Loans receivable, gross	$ 685,198		$ 563,534
Ratio	1.10%		1.40%
Loans Collectively Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 21,662		$ 17,223
Loans receivable, gross	$ 484,902		$ 421,816
Ratio	4.50%		4.60%
Loans Collectively Evaluated for Impairment [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 864		$ 928
Loans receivable, gross	$ 121,241		$ 114,393
Ratio	0.70%		0.90%
Loans Collectively Evaluated for Impairment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 3,089		$ 3,227
Loans receivable, gross	$ 205,862		$ 132,590
Ratio	1.50%		2.40%
Loans Individually Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 60
Loans receivable, gross	$ 88,008		$ 134,736
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 49,305		$ 72,869
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 60
Loans receivable, gross	$ 6,983		$ 9,159
Ratio	0.00%		0.70%
Loans Individually Evaluated for Impairment [Member] | Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 0		$ 360
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 3,237		$ 3,833
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 11,044		$ 12,939
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 4,584		$ 6,124
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 11,133		$ 27,802
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 0		$ 0
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 1,633		$ 1,650
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for probable losses	$ 0		$ 0
Loans receivable, gross	$ 89		$ 0
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



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Allowance as a Percentage of Outstanding Loans and Leases

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