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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 12,853,678	$ 12,201,387
Non-Performing Loans, Amount	55,686	49,580
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	5,798,966	5,711,004
Construction
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	1,890,668	1,597,996
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	624,479	602,631
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	155,204	124,308
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	102,036	104,405
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	1,385,125	1,303,148
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	1,452,168	1,434,610
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	1,140,874	1,093,360
HELOC
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	130,852	144,850
Consumer
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	173,306	85,075
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 12,797,992	$ 12,151,807
Performing Loans, % of Total Gross Loans	99.60%	99.60%
Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 5,771,323	$ 5,683,074
Performing Loans, % of Total Gross Loans	99.50%	99.50%
Performing Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,888,241	$ 1,597,996
Performing Loans, % of Total Gross Loans	99.90%	100.00%
Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 624,479	$ 602,540
Performing Loans, % of Total Gross Loans	100.00%	99.90%
Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 154,284	$ 124,012
Performing Loans, % of Total Gross Loans	99.40%	99.80%
Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 101,249	$ 103,800
Performing Loans, % of Total Gross Loans	99.20%	99.40%
Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,385,125	$ 1,303,009
Performing Loans, % of Total Gross Loans	100.00%	99.90%
Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,443,197	$ 1,422,795
Performing Loans, % of Total Gross Loans	99.40%	99.20%
Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,126,480	$ 1,085,278
Performing Loans, % of Total Gross Loans	98.70%	99.30%
Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 130,329	$ 144,319
Performing Loans, % of Total Gross Loans	99.60%	99.60%
Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 173,285	$ 84,984
Performing Loans, % of Total Gross Loans	100.00%	99.90%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 70,093	$ 70,238
Non-Performing Loans, Amount	$ 55,686	$ 49,580
Non-Performing Loans, % of Total Gross Loans	0.40%	0.40%
Non-Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 27,643	$ 27,930
Non-Performing Loans, % of Total Gross Loans	0.50%	0.50%
Non-Performing Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 2,427	$ 0
Non-Performing Loans, % of Total Gross Loans	0.10%	0.00%
Non-Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 0	$ 91
Non-Performing Loans, % of Total Gross Loans	0.00%	0.10%
Non-Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 920	$ 296
Non-Performing Loans, % of Total Gross Loans	0.60%	0.20%
Non-Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 787	$ 605
Non-Performing Loans, % of Total Gross Loans	0.80%	0.60%
Non-Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 0	$ 139
Non-Performing Loans, % of Total Gross Loans	0.00%	0.10%
Non-Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 8,971	$ 11,815
Non-Performing Loans, % of Total Gross Loans	0.60%	0.80%
Non-Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 14,394	$ 8,082
Non-Performing Loans, % of Total Gross Loans	1.30%	0.70%
Non-Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 523	$ 531
Non-Performing Loans, % of Total Gross Loans	0.40%	0.40%
Non-Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 21	$ 91
Non-Performing Loans, % of Total Gross Loans	0.00%	0.10%

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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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