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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 13,020,468	$ 12,853,678
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 12,969,018	$ 12,797,992
Performing Loans, % of Total Gross Loans	99.60%	99.60%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 62,730	$ 70,093
Non-Performing Loans, Amount	$ 51,450	$ 55,686
Non-Performing Loans, % of Total Gross Loans	0.40%	0.40%
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 5,844,963	$ 5,798,966
Single-family residential | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 5,820,215	$ 5,771,323
Performing Loans, % of Total Gross Loans	99.60%	99.50%
Single-family residential | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 24,748	$ 27,643
Non-Performing Loans, % of Total Gross Loans	0.40%	0.50%
Construction
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,841,674	$ 1,890,668
Construction | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,840,294	$ 1,888,241
Performing Loans, % of Total Gross Loans	99.90%	99.90%
Construction | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 1,380	$ 2,427
Non-Performing Loans, % of Total Gross Loans	0.10%	0.10%
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 607,071	$ 624,479
Construction - custom | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 607,071	$ 624,479
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Construction - custom | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 0	$ 0
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 181,323	$ 155,204
Land - acquisition & development | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 180,885	$ 154,284
Performing Loans, % of Total Gross Loans	99.80%	99.40%
Land - acquisition & development | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 438	$ 920
Non-Performing Loans, % of Total Gross Loans	0.20%	0.60%
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 100,563	$ 102,036
Land - consumer lot loans | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 99,778	$ 101,249
Performing Loans, % of Total Gross Loans	99.20%	99.20%
Land - consumer lot loans | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 785	$ 787
Non-Performing Loans, % of Total Gross Loans	0.80%	0.80%
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,405,172	$ 1,385,125
Multi-family | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,405,172	$ 1,385,125
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Multi-family | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 0	$ 0
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,526,887	$ 1,452,168
Commercial real estate | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,517,409	$ 1,443,197
Performing Loans, % of Total Gross Loans	99.40%	99.40%
Commercial real estate | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 9,478	$ 8,971
Non-Performing Loans, % of Total Gross Loans	0.60%	0.60%
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,213,738	$ 1,140,874
Commercial & industrial | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,199,743	$ 1,126,480
Performing Loans, % of Total Gross Loans	98.80%	98.70%
Commercial & industrial | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 13,995	$ 14,394
Non-Performing Loans, % of Total Gross Loans	1.20%	1.30%
HELOC
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 136,856	$ 130,852
HELOC | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 136,257	$ 130,329
Performing Loans, % of Total Gross Loans	99.60%	99.60%
HELOC | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 599	$ 523
Non-Performing Loans, % of Total Gross Loans	0.40%	0.40%
Consumer
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 162,221	$ 173,306
Consumer | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 162,194	$ 173,285
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Consumer | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 27	$ 21
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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