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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 10,630,552	$ 10,071,124
Current	10,561,096	10,002,844
Past due	$ 69,456	$ 68,280
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.65%	0.68%
Ratio of total past due loans to total loans receivable, current	99.35%	99.32%
Ratio of total past due loans to total loans receivable, past due	0.65%	0.68%
Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 22,162	$ 25,007
Ratio of total past due loans to total loans receivable, past due	0.21%	0.25%
Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 8,409	$ 7,014
Ratio of total past due loans to total loans receivable, past due	0.08%	0.07%
Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 38,885	$ 36,259
Ratio of total past due loans to total loans receivable, past due	0.37%	0.36%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 5,692,305	$ 5,658,122
Current	5,639,158	5,601,457
Past due	$ 53,147	$ 56,665
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.93%	1.00%
Single-family residential | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 13,644	$ 20,916
Single-family residential | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	7,660	5,271
Single-family residential | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	31,843	30,478
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	593,479	498,450
Current	592,877	498,450
Past due	$ 601	$ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.10%	0.00%
Construction | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 601	$ 0
Construction | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Construction | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	251,906	229,957
Current	251,666	229,419
Past due	$ 240	$ 538
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.10%	0.23%
Construction - custom | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 0	$ 538
Construction - custom | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Construction - custom | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	240	0
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	103,280	94,928
Current	103,018	94,928
Past due	$ 262	$ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.25%	0.00%
Land - acquisition & development | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 262	$ 0
Land - acquisition & development | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Land - acquisition & development | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	101,168	104,534
Current	99,907	102,472
Past due	$ 1,261	$ 2,062
Ratio of past due loans to total loans, net of charge-offs and LIPs	1.25%	1.97%
Land - consumer lot loans | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 360	$ 816
Land - consumer lot loans | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	333	687
Land - consumer lot loans | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	568	559
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	1,266,845	1,124,290
Current	1,265,622	1,122,307
Past due	$ 1,224	$ 1,983
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.10%	0.18%
Multi-family | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 0	$ 1,190
Multi-family | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	399
Multi-family | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,224	394
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	1,296,019	1,093,549
Current	1,289,677	1,088,680
Past due	$ 6,342	$ 4,869
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.49%	0.45%
Commercial real estate | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 1,802	$ 69
Commercial real estate | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	298	325
Commercial real estate | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	4,242	4,475
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	1,071,622	978,582
Current	1,066,658	978,540
Past due	$ 4,964	$ 42
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.46%	0.00%
Commercial & industrial | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 4,964	$ 0
Commercial & industrial | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	42
Commercial & industrial | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	146,169	149,713
Current	145,355	148,513
Past due	$ 814	$ 1,200
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.56%	0.80%
HELOC | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 124	$ 763
HELOC | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	20	164
HELOC | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	670	273
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	107,759	138,999
Current	107,158	138,078
Past due	$ 601	$ 921
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.56%	0.66%
Consumer | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 405	$ 715
Consumer | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	98	126
Consumer | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 98	$ 80

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-Publisher FASB
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