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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 9,823,270	$ 8,882,920
Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	9,493,987	8,409,022
Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	166,293	184,188
Credit-impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	87,081	76,507
Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	75,909	213,203
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,700,782
Single-family residential | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,651,845	5,560,203
Construction - speculative
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	200,508
Construction - speculative | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	200,509	140,060
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	396,309
Construction - custom | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	396,307	385,824
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	98,282
Land - acquisition & development | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	94,208	77,832
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	106,813
Land - consumer lot loans | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	103,989	108,623
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,129,437
Multi-family | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,125,722	917,286
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,186,551
Commercial real estate | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	986,270	591,336
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	657,580
Commercial & industrial | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	612,836	379,226
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	149,527
HELOC | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	127,646	116,042
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	197,481
Consumer | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	194,655	132,590
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 9,605,919	$ 8,558,800
Grade as percentage of total gross assets	97.80%	96.40%
Pass | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 9,333,233	$ 8,205,380
Pass | Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	149,891	156,954
Pass | Credit-impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	61,019	61,332
Pass | Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	61,776	135,134
Pass | Single-family residential | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,558,700	5,426,895
Pass | Construction - speculative | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	197,935	134,950
Pass | Construction - custom | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	396,307	385,824
Pass | Land - acquisition & development | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	89,656	71,692
Pass | Land - consumer lot loans | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	103,569	108,013
Pass | Multi-family | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,118,673	912,728
Pass | Commercial real estate | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	971,510	557,914
Pass | Commercial & industrial | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	575,034	359,221
Pass | HELOC | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	127,398	115,794
Pass | Consumer | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	194,451	132,349
Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 6,721	$ 38,675
Grade as percentage of total gross assets	0.10%	0.40%
Special mention | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 6,721	$ 19,504
Special mention | Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	16,213
Special mention | Credit-impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	2,143
Special mention | Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	815
Special mention | Single-family residential | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	2,793
Special mention | Construction - speculative | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Construction - custom | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Land - acquisition & development | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Land - consumer lot loans | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Multi-family | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	865	0
Special mention | Commercial real estate | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,360	1,971
Special mention | Commercial & industrial | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,496	14,740
Special mention | HELOC | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Consumer | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 210,630	$ 284,862
Grade as percentage of total gross assets	2.10%	3.20%
Substandard | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 154,033	$ 184,138
Substandard | Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	16,402	10,963
Substandard | Credit-impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	26,062	13,032
Substandard | Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	14,133	76,729
Substandard | Single-family residential | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	93,145	130,515
Substandard | Construction - speculative | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,574	5,110
Substandard | Construction - custom | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Substandard | Land - acquisition & development | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,552	6,140
Substandard | Land - consumer lot loans | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	420	610
Substandard | Multi-family | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,184	4,558
Substandard | Commercial real estate | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	10,400	31,451
Substandard | Commercial & industrial | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	36,306	5,265
Substandard | HELOC | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	248	248
Substandard | Consumer | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	204	241
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 583
Grade as percentage of total gross assets	0.00%	0.00%
Doubtful | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Doubtful | Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	58
Doubtful | Credit-impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	525
Doubtful | Single-family residential | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Construction - speculative | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Construction - custom | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Land - acquisition & development | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Land - consumer lot loans | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Multi-family | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Commercial real estate | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Commercial & industrial | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | HELOC | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Consumer | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Grade as percentage of total gross assets	0.00%	0.00%
Loss | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Loss | Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Credit-impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Single-family residential | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Construction - speculative | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Construction - custom | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Land - acquisition & development | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Land - consumer lot loans | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Multi-family | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Commercial real estate | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Commercial & industrial | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | HELOC | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Consumer | Non-acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0

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+ References

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- Definition

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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