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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,572,201		$ 9,823,270
Nonaccrual loans by portfolio segment	47,349		67,810
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 10,255,801		$ 9,426,177
Total grade as a % of total net loans	99.50%		99.30%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 79,031	$ 93,329	$ 128,577
Nonaccrual loans by portfolio segment	$ 47,349	$ 54,559	$ 67,810
Grade as a percentage of total gross loans	0.50%		0.70%
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 36,707		$ 59,074
Single-family residential | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,556,312		$ 5,592,771
Total grade as a % of total net loans	99.30%		99.00%
Single-family residential | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 36,707		$ 59,074
Grade as a percentage of total gross loans	0.70%		1.00%
Construction
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0		$ 754
Construction | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,016,305		$ 199,755
Total grade as a % of total net loans	100.00%		99.60%
Construction | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0		$ 754
Grade as a percentage of total gross loans	0.00%		0.40%
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 506		$ 732
Construction - custom | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 408,610		$ 395,575
Total grade as a % of total net loans	99.90%		99.80%
Construction - custom | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 506		$ 732
Grade as a percentage of total gross loans	0.10%		0.20%
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 427		$ 0
Land - acquisition & development | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 101,422		$ 94,208
Total grade as a % of total net loans	99.60%		100.00%
Land - acquisition & development | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 427		$ 0
Grade as a percentage of total gross loans	0.40%		0.00%
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,105		$ 1,273
Land - consumer lot loans | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 100,626		$ 102,716
Total grade as a % of total net loans	98.90%		98.80%
Land - consumer lot loans | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,105		$ 1,273
Grade as a percentage of total gross loans	1.10%		1.20%
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,238		$ 2,558
Multi-family | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,093,495		$ 1,123,165
Total grade as a % of total net loans	99.90%		99.80%
Multi-family | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 1,238		$ 2,558
Grade as a percentage of total gross loans	0.10%		0.20%
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 6,297		$ 2,176
Commercial real estate | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 880,661		$ 984,093
Total grade as a % of total net loans	99.30%		99.80%
Commercial real estate | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 6,297		$ 2,176
Grade as a percentage of total gross loans	0.70%		0.20%
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 521		$ 0
Commercial & industrial | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 809,921		$ 612,836
Total grade as a % of total net loans	99.90%		100.00%
Commercial & industrial | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 521		$ 0
Grade as a percentage of total gross loans	0.10%		0.00%
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 548		$ 563
HELOC | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 134,188		$ 127,083
Total grade as a % of total net loans	99.60%		99.60%
HELOC | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 548		$ 563
Grade as a percentage of total gross loans	0.40%		0.40%
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0		$ 680
Consumer | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 154,261		$ 193,975
Total grade as a % of total net loans	100.00%		99.70%
Consumer | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0		$ 680
Grade as a percentage of total gross loans	0.00%		0.30%

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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
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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