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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,572,201	$ 9,823,270
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,371,828	$ 9,605,919
Total grade as a % of total net loans	98.10%	97.80%
Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 21,176	$ 6,721
Total grade as a % of total net loans	0.20%	0.10%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 179,193	$ 210,630
Total grade as a % of total net loans	1.70%	2.10%
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Total grade as a % of total net loans	0.00%	0.00%
Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 4	$ 0
Total grade as a % of total net loans	0.00%	0.00%
Non-Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,303,150	$ 9,493,987
Non-Acquired loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	10,142,163	9,333,233
Non-Acquired loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	21,129	6,721
Non-Acquired loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	139,858	154,033
Non-Acquired loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,593,018	5,651,845
Non-Acquired loans | Single-family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,533,837	5,558,700
Non-Acquired loans | Single-family residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Single-family residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	59,181	93,145
Non-Acquired loans | Single-family residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Single-family residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,016,305	200,509
Non-Acquired loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,012,203	197,935
Non-Acquired loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,102	2,574
Non-Acquired loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	409,116	396,307
Non-Acquired loans | Construction - custom | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	408,538	396,307
Non-Acquired loans | Construction - custom | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Construction - custom | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	578	0
Non-Acquired loans | Construction - custom | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Construction - custom | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	101,849	94,208
Non-Acquired loans | Land - acquisition & development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	94,830	89,656
Non-Acquired loans | Land - acquisition & development | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Land - acquisition & development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,019	4,552
Non-Acquired loans | Land - acquisition & development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Land - acquisition & development | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	101,731	103,989
Non-Acquired loans | Land - consumer lot loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	100,173	103,569
Non-Acquired loans | Land - consumer lot loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Land - consumer lot loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,558	420
Non-Acquired loans | Land - consumer lot loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Land - consumer lot loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,094,736	1,125,722
Non-Acquired loans | Multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,087,363	1,118,673
Non-Acquired loans | Multi-family | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,252	865
Non-Acquired loans | Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,121	6,184
Non-Acquired loans | Multi-family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Multi-family | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	886,957	986,270
Non-Acquired loans | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	861,771	971,510
Non-Acquired loans | Commercial real estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	11,345	4,360
Non-Acquired loans | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	13,841	10,400
Non-Acquired loans | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Commercial real estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	810,442	612,836
Non-Acquired loans | Commercial & industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	755,361	575,034
Non-Acquired loans | Commercial & industrial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,532	1,496
Non-Acquired loans | Commercial & industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	48,549	36,306
Non-Acquired loans | Commercial & industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Commercial & industrial | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	134,735	127,646
Non-Acquired loans | HELOC | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	133,939	127,398
Non-Acquired loans | HELOC | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | HELOC | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	796	248
Non-Acquired loans | HELOC | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | HELOC | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	154,261	194,655
Non-Acquired loans | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	154,148	194,451
Non-Acquired loans | Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	113	204
Non-Acquired loans | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-Acquired loans | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	140,369	166,293
Non-impaired acquired loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	132,710	149,891
Non-impaired acquired loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	47	0
Non-impaired acquired loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,612	16,402
Non-impaired acquired loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Non-impaired acquired loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Credit impaired acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	96,491	87,081
Credit impaired acquired loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	65,106	61,019
Credit impaired acquired loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Credit impaired acquired loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	31,381	26,062
Credit impaired acquired loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Credit impaired acquired loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4	0
Covered loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	32,191	75,909
Covered loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	31,849	61,776
Covered loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Covered loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	342	14,133
Covered loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Covered loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0

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+ References

No definition available.

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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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