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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 12,092,131	$ 12,111,047
Days delinquent, current	12,055,901	12,075,677
Days delinquent, past due	$ 36,230	$ 35,370
% based on $	0.30%	0.29%
% based on $, current	99.70%	99.71%
% based on $, past due	0.30%	0.29%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 8,853	$ 6,273
% based on $, past due	0.07%	0.05%
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 6,026	$ 4,415
% based on $, past due	0.05%	0.04%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 21,351	$ 24,682
% based on $, past due	0.18%	0.20%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 5,702,058	$ 5,835,186
Days delinquent, current	5,675,672	5,809,239
Days delinquent, past due	$ 26,386	$ 25,947
% based on $	0.46%	0.44%
Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 6,077	$ 3,672
Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	3,718	3,211
Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	16,591	19,064
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,189,457	1,164,889
Days delinquent, current	1,188,042	1,164,889
Days delinquent, past due	$ 1,415	$ 0
% based on $	0.12%	0.00%
Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 0	$ 0
Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	1,415	0
Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	0	0
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	259,944	255,505
Days delinquent, current	259,944	255,505
Days delinquent, past due	$ 0	$ 0
% based on $	0.00%	0.00%
Construction - custom | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 0	$ 0
Construction - custom | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	0	0
Construction - custom | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	0	0
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	153,942	161,194
Days delinquent, current	153,056	161,194
Days delinquent, past due	$ 886	$ 0
% based on $	0.58%	0.00%
Land - acquisition & development | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 810	$ 0
Land - acquisition & development | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	76	0
Land - acquisition & development | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	0	0
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	97,097	99,694
Days delinquent, current	96,635	98,916
Days delinquent, past due	$ 462	$ 778
% based on $	0.48%	0.78%
Land - consumer lot loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 180	$ 112
Land - consumer lot loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	136	619
Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	146	47
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,436,693	1,422,652
Days delinquent, current	1,436,556	1,422,652
Days delinquent, past due	$ 137	$ 0
% based on $	0.01%	0.00%
Multi-family | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 137	$ 0
Multi-family | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	0	0
Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,643,099	1,631,171
Days delinquent, current	1,638,407	1,625,509
Days delinquent, past due	$ 4,692	$ 5,662
% based on $	0.29%	0.35%
Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 602	$ 1,614
Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	60	285
Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	4,030	3,763
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,352,738	1,268,695
Days delinquent, current	1,352,449	1,267,828
Days delinquent, past due	$ 289	$ 867
% based on $	0.02%	0.07%
Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 223	$ 0
Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	10	0
Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	56	867
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	141,274	142,178
Days delinquent, current	139,892	140,718
Days delinquent, past due	$ 1,382	$ 1,460
% based on $	0.98%	1.03%
HELOC | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 530	$ 580
HELOC | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	427	183
HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	425	697
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	115,829	129,883
Days delinquent, current	115,248	129,227
Days delinquent, past due	$ 581	$ 656
% based on $	0.50%	0.51%
Consumer | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 294	$ 295
Consumer | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	184	117
Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days delinquent, past due	$ 103	$ 244

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