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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 13,404,413	$ 13,312,388
Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 13,374,324	$ 13,278,657
Performing Loans, % of Total Gross Loans	99.80%	99.70%
Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 39,742	$ 43,826
Non-Performing Loans, Amount	$ 30,089	$ 33,731
Non-Performing Loans, % of Total Gross Loans	0.20%	0.30%
Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 5,702,071	$ 5,835,194
Single-family residential | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 5,679,057	$ 5,809,923
Performing Loans, % of Total Gross Loans	99.60%	99.60%
Single-family residential | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 23,014	$ 25,271
Non-Performing Loans, % of Total Gross Loans	0.40%	0.40%
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 2,174,313	$ 2,038,052
Construction | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 2,174,313	$ 2,038,052
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Construction | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 0	$ 0
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%
Construction - custom
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 538,234	$ 540,741
Construction - custom | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 538,234	$ 540,741
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Construction - custom | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 0	$ 0
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%
Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 203,043	$ 204,107
Land - acquisition & development | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 202,957	$ 203,938
Performing Loans, % of Total Gross Loans	100.00%	99.90%
Land - acquisition & development | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 86	$ 169
Non-Performing Loans, % of Total Gross Loans	0.00%	0.10%
Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 97,097	$ 99,694
Land - consumer lot loans | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 96,763	$ 99,448
Performing Loans, % of Total Gross Loans	99.70%	99.80%
Land - consumer lot loans | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 334	$ 246
Non-Performing Loans, % of Total Gross Loans	0.30%	0.20%
Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 1,436,715	$ 1,422,674
Multi-family | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 1,436,715	$ 1,422,674
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Multi-family | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 0	$ 0
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 1,643,099	$ 1,631,170
Commercial real estate | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 1,637,542	$ 1,625,335
Performing Loans, % of Total Gross Loans	99.70%	99.60%
Commercial real estate | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 5,557	$ 5,835
Non-Performing Loans, % of Total Gross Loans	0.30%	0.40%
Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 1,352,738	$ 1,268,695
Commercial & industrial | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 1,352,271	$ 1,267,403
Performing Loans, % of Total Gross Loans	100.00%	99.90%
Commercial & industrial | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 467	$ 1,292
Non-Performing Loans, % of Total Gross Loans	0.00%	0.10%
HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 141,274	$ 142,178
HELOC | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 140,644	$ 141,271
Performing Loans, % of Total Gross Loans	99.60%	99.40%
HELOC | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 630	$ 907
Non-Performing Loans, % of Total Gross Loans	0.40%	0.60%
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 115,829	$ 129,883
Consumer | Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Performing Loans, Amount	$ 115,828	$ 129,872
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Consumer | Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Non-Performing Loans, Amount	$ 1	$ 11
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%

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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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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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Grade as Percentage of Total Gross Loans

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