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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,110,184	$ 9,823,270
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 9,900,516	$ 9,605,919
Total grade as a % of total net loans	97.90%	97.80%
Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 21,269	$ 6,721
Total grade as a % of total net loans	0.20%	0.10%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 188,399	$ 210,630
Total grade as a % of total net loans	1.90%	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	$ 0	$ 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	$ 9,791,190	$ 9,493,987
Non-Acquired loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	9,630,645	9,333,233
Non-Acquired loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	21,070	6,721
Non-Acquired loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	139,475	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	5,629,715	5,651,845
Non-Acquired loans | Single-family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,551,785	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	77,930	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	660,238	200,509
Non-Acquired loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	655,964	197,935
Non-Acquired loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,274	0
Non-Acquired loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	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	404,849	396,307
Non-Acquired loans | Construction - custom | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	402,000	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	2,849	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	97,025	94,208
Non-Acquired loans | Land - acquisition & development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	87,772	89,656
Non-Acquired loans | Land - acquisition & development | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,627	0
Non-Acquired loans | Land - acquisition & development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,626	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	102,376	103,989
Non-Acquired loans | Land - consumer lot loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	100,125	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	2,251	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	997,696	1,125,722
Non-Acquired loans | Multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	997,696	1,118,673
Non-Acquired loans | Multi-family | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	865
Non-Acquired loans | Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	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	839,157	986,270
Non-Acquired loans | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	813,974	971,510
Non-Acquired loans | Commercial real estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	8,111	4,360
Non-Acquired loans | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	17,073	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	751,073	612,836
Non-Acquired loans | Commercial & industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	713,240	575,034
Non-Acquired loans | Commercial & industrial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,058	1,496
Non-Acquired loans | Commercial & industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	34,775	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	127,919	127,646
Non-Acquired loans | HELOC | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	127,198	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	721	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	181,142	194,655
Non-Acquired loans | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	180,892	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	250	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
Acquired loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	164,380	166,293
Acquired loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	152,761	149,891
Acquired loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Acquired loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	11,619	16,402
Acquired loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
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	116,030	87,081
Credit impaired acquired loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	79,555	61,019
Credit impaired acquired loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	199	0
Credit impaired acquired loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	36,276	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	0	0
Covered loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	38,584	75,909
Covered loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	37,555	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	1,029	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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