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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 11,280,574	$ 11,051,453
Current	11,232,320	11,007,440
Past due	$ 48,254	$ 44,013
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.43%	0.40%
Ratio of total past due loans to total loans receivable, current	99.57%	99.60%
Ratio of total past due loans to total loans receivable, past due	0.43%	0.40%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 15,222	$ 12,015
Ratio of total past due loans to total loans receivable, past due	0.13%	0.11%
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 9,034	$ 6,245
Ratio of total past due loans to total loans receivable, past due	0.08%	0.06%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 23,998	$ 25,753
Ratio of total past due loans to total loans receivable, past due	0.21%	0.23%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 5,692,045	$ 5,709,690
Current	5,655,873	5,671,933
Past due	$ 36,172	$ 37,757
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.64%	0.66%
Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 9,801	$ 10,925
Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	6,073	4,810
Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	20,298	22,022
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	852,164	793,959
Current	847,793	793,959
Past due	$ 4,371	$ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.51%	0.00%
Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 1,500	$ 0
Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	2,507	0
Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	364	0
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	292,255	277,599
Current	292,255	277,508
Past due	$ 0	$ 91
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.00%	0.03%
Construction - custom | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 0	$ 0
Construction - custom | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Construction - custom | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	91
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	112,260	104,856
Current	111,018	104,526
Past due	$ 1,242	$ 330
Ratio of past due loans to total loans, net of charge-offs and LIPs	1.11%	0.31%
Land - acquisition & development | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 0	$ 0
Land - acquisition & development | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Land - acquisition & development | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,242	330
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	104,996	104,335
Current	104,246	103,389
Past due	$ 750	$ 946
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.71%	0.91%
Land - consumer lot loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 107	$ 112
Land - consumer lot loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	153	680
Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	490	154
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	1,312,673	1,303,119
Current	1,312,423	1,302,720
Past due	$ 250	$ 399
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.02%	0.03%
Multi-family | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 0	$ 5
Multi-family | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	255
Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	250	139
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	1,436,508	1,434,610
Current	1,436,064	1,432,052
Past due	$ 444	$ 2,558
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.03%	0.18%
Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 129	$ 507
Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	315	2,051
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	1,120,707	1,093,360
Current	1,117,240	1,092,735
Past due	$ 3,467	$ 625
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.31%	0.06%
Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 2,894	$ 0
Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	51
Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	573	574
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	136,995	144,850
Current	136,004	143,974
Past due	$ 991	$ 876
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.72%	0.60%
HELOC | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 439	$ 221
HELOC | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	147	342
HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	405	313
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	219,971	85,075
Current	219,404	84,644
Past due	$ 567	$ 431
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.26%	0.51%
Consumer | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 352	$ 245
Consumer | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	154	107
Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 61	$ 79

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-Publisher FASB
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