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Allowance for Loan Losses - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 13,312,388 | $ 12,853,678
Non-Performing loans, amount | 33,731 | 55,686
Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 5,835,194 | 5,798,966
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 2,038,052 | 1,890,668
Construction - custom |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 540,741 | 624,479
Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 204,107 | 155,204
Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 99,694 | 102,036
Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 1,422,674 | 1,385,125
Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 1,631,170 | 1,452,168
Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 1,268,695 | 1,140,874
HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 142,178 | 130,852
Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | 129,883 | 173,306
Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 13,278,657 | $ 12,797,992
Performing loans, % of total gross loans | 99.70% | 99.60%
Performing Loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 5,809,923 | $ 5,771,323
Performing loans, % of total gross loans | 99.60% | 99.50%
Performing Loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 2,038,052 | $ 1,888,241
Performing loans, % of total gross loans | 100.00% | 99.90%
Performing Loans | Construction - custom |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 540,741 | $ 624,479
Performing loans, % of total gross loans | 100.00% | 100.00%
Performing Loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 203,938 | $ 154,284
Performing loans, % of total gross loans | 99.90% | 99.40%
Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 99,448 | $ 101,249
Performing loans, % of total gross loans | 99.80% | 99.20%
Performing Loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 1,422,674 | $ 1,385,125
Performing loans, % of total gross loans | 100.00% | 100.00%
Performing Loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 1,625,335 | $ 1,443,197
Performing loans, % of total gross loans | 99.60% | 99.40%
Performing Loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 1,267,403 | $ 1,126,480
Performing loans, % of total gross loans | 99.90% | 98.70%
Performing Loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 141,271 | $ 130,329
Performing loans, % of total gross loans | 99.40% | 99.60%
Performing Loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 129,872 | $ 173,285
Performing loans, % of total gross loans | 100.00% | 100.00%
Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing loans, amount | $ 43,826 | $ 70,093
Non-Performing loans, amount | $ 33,731 | $ 55,686
Non-Performing loans, % of total gross loans | 0.30% | 0.40%
Non-Performing Loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 25,271 | $ 27,643
Non-Performing loans, % of total gross loans | 0.40% | 0.50%
Non-Performing Loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 0 | $ 2,427
Non-Performing loans, % of total gross loans | 0.00% | 0.10%
Non-Performing Loans | Construction - custom |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 0 | $ 0
Non-Performing loans, % of total gross loans | 0.00% | 0.00%
Non-Performing Loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 169 | $ 920
Non-Performing loans, % of total gross loans | 0.10% | 0.60%
Non-Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 246 | $ 787
Non-Performing loans, % of total gross loans | 0.20% | 0.80%
Non-Performing Loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 0 | $ 0
Non-Performing loans, % of total gross loans | 0.00% | 0.00%
Non-Performing Loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 5,835 | $ 8,971
Non-Performing loans, % of total gross loans | 0.40% | 0.60%
Non-Performing Loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 1,292 | $ 14,394
Non-Performing loans, % of total gross loans | 0.10% | 1.30%
Non-Performing Loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 907 | $ 523
Non-Performing loans, % of total gross loans | 0.60% | 0.40%
Non-Performing Loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing loans, amount | $ 11 | $ 21
Non-Performing loans, % of total gross loans | 0.00% | 0.00%

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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