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Allowance for Losses on Loans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reversal of loan losses	$ 1,650	$ 1,932	$ 3,150	$ 11,381
Charge-offs, net of (recoveries)	(2,897)	313
Loans receivable, gross	10,572,201		10,572,201			$ 9,823,270
Nonaccrual of interest	$ 47,349		$ 47,349			$ 67,810
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.73%		0.73%		0.90%	0.88%
Allowance for loan losses	$ 111,016	105,611	$ 111,016	105,611	$ 109,919	$ 106,829	$ 108,323	$ 114,591
Allowance for credit losses and reserve for unfunded commitments	$ 114,251		$ 114,251
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans	1.08%		1.08%
Acquired loans subject to general allowance	$ 21,158		$ 21,158
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	9,438,408		9,438,408			8,963,453
Allowance for loan losses	110,119		110,119			106,554
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	51,562		51,562			85,513
Allowance for loan losses	897		897			275
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,235		3,235			3,085
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual of interest	36,707		36,707			59,074
Allowance for loan losses	40,681	$ 52,004	40,681	$ 52,004	41,828	47,347	$ 54,762	$ 62,763
Single-family residential | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,547,373		5,547,373			5,595,752
Allowance for loan losses	39,986		39,986			47,073
Single-family residential | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	24,451		24,451			51,718
Allowance for loan losses	693		693			275
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 79,031		$ 79,031		$ 93,329	$ 128,577
Ratio of non-performing assets to total assets	0.53%		0.53%		0.64%	0.88%
Nonaccrual of interest	$ 47,349		$ 47,349		$ 54,559	$ 67,810
Non-Performing Loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual of interest	$ 36,707		$ 36,707			$ 59,074

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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.

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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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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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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 50
-Paragraph 7
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Amount of expense related to estimated loss from loan and lease transactions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
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Acquired Loans Subject to General Allowance

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Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries

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Loans and Leases Receivable, Allowance for Credit Losses and Reserve for Unfunded Commitments

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Loans and Leases Receivable, Allowance for Credit Losses and Reserve for Unfunded Commitments, Percent of Gross Loans

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Ratio of Non-Performing Assets to Total Assets

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