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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 13,434,649 | $ 13,312,388
Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 13,402,039 | $ 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 | $ 41,387 | $ 43,826
Non-Performing Loans, Amount | $ 32,610 | $ 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 | $ 5,582,244 | $ 5,835,194
Single-family residential | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 5,559,385 | $ 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 | $ 22,859 | $ 25,271
Non-Performing Loans, % of Total Gross Loans | 0.40% | 0.40%
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 2,204,283 | $ 2,038,052
Construction | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 2,200,930 | $ 2,038,052
Performing Loans, % of Total Gross Loans | 99.80% | 100.00%
Construction | Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing Loans, Amount | $ 3,353 | $ 0
Non-Performing Loans, % of Total Gross Loans | 0.20% | 0.00%
Construction - custom |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 547,731 | $ 540,741
Construction - custom | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 547,731 | $ 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 | $ 197,010 | $ 204,107
Land - acquisition & development | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 196,928 | $ 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 | $ 82 | $ 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 | $ 96,579 | $ 99,694
Land - consumer lot loans | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 96,171 | $ 99,448
Performing Loans, % of Total Gross Loans | 99.60% | 99.80%
Land - consumer lot loans | Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing Loans, Amount | $ 408 | $ 246
Non-Performing Loans, % of Total Gross Loans | 0.40% | 0.20%
Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 1,467,231 | $ 1,422,674
Multi-family | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 1,467,231 | $ 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 | $ 1,717,535 | $ 1,631,170
Commercial real estate | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 1,713,161 | $ 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 | $ 4,374 | $ 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 | $ 1,371,128 | $ 1,268,695
Commercial & industrial | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 1,370,658 | $ 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 | $ 470 | $ 1,292
Non-Performing Loans, % of Total Gross Loans | 0.00% | 0.10%
HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 145,761 | $ 142,178
HELOC | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 144,697 | $ 141,271
Performing Loans, % of Total Gross Loans | 99.30% | 99.40%
HELOC | Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-Performing Loans, Amount | $ 1,064 | $ 907
Non-Performing Loans, % of Total Gross Loans | 0.70% | 0.60%
Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 105,147 | $ 129,883
Consumer | Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Performing Loans, Amount | $ 105,147 | $ 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 | $ 0 | $ 11
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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