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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 12,737,292 | $ 12,201,387
Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 12,676,708 | $ 12,151,807
Performing Loans, % of Total Gross Loans | 99.50% | 99.60%
Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 71,859 | $ 70,238
Non-Performing Loans, Amount | $ 60,584 | $ 49,580
Non-Performing Loans, % of Total Gross Loans | 0.50% | 0.40%
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 5,745,598 | $ 5,711,004
Single-family residential | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 5,719,479 | $ 5,683,074
Performing Loans, % of Total Gross Loans | 99.50% | 99.50%
Single-family residential | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 26,119 | $ 27,930
Non-Performing Loans, % of Total Gross Loans | 0.50% | 0.50%
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,885,034 | $ 1,597,996
Construction | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,883,193 | $ 1,597,996
Performing Loans, % of Total Gross Loans | 99.90% | 100.00%
Construction | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 1,841 | $ 0
Non-Performing Loans, % of Total Gross Loans | 0.10% | 0.00%
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 612,688 | $ 602,631
Construction - custom | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 612,688 | $ 602,540
Performing Loans, % of Total Gross Loans | 100.00% | 99.90%
Construction - custom | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 0 | $ 91
Non-Performing Loans, % of Total Gross Loans | 0.00% | 0.10%
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 150,936 | $ 124,308
Land - acquisition & development | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 149,179 | $ 124,012
Performing Loans, % of Total Gross Loans | 98.80% | 99.80%
Land - acquisition & development | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 1,757 | $ 296
Non-Performing Loans, % of Total Gross Loans | 1.20% | 0.20%
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 103,118 | $ 104,405
Land - consumer lot loans | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 102,476 | $ 103,800
Performing Loans, % of Total Gross Loans | 99.40% | 99.40%
Land - consumer lot loans | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 642 | $ 605
Non-Performing Loans, % of Total Gross Loans | 0.60% | 0.60%
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,346,534 | $ 1,303,148
Multi-family | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,346,534 | $ 1,303,009
Performing Loans, % of Total Gross Loans | 100.00% | 99.90%
Multi-family | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 0 | $ 139
Non-Performing Loans, % of Total Gross Loans | 0.00% | 0.10%
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,435,418 | $ 1,434,610
Commercial real estate | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,425,734 | $ 1,422,795
Performing Loans, % of Total Gross Loans | 99.30% | 99.20%
Commercial real estate | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 9,684 | $ 11,815
Non-Performing Loans, % of Total Gross Loans | 0.70% | 0.80%
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,133,075 | $ 1,093,360
Commercial & industrial | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 1,113,199 | $ 1,085,278
Performing Loans, % of Total Gross Loans | 98.20% | 99.30%
Commercial & industrial | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 19,876 | $ 8,082
Non-Performing Loans, % of Total Gross Loans | 1.80% | 0.70%
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 136,766 | $ 144,850
HELOC | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 136,129 | $ 144,319
Performing Loans, % of Total Gross Loans | 99.50% | 99.60%
HELOC | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 637 | $ 531
Non-Performing Loans, % of Total Gross Loans | 0.50% | 0.40%
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 188,125 | $ 85,075
Consumer | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing Loans, Amount | $ 188,097 | $ 84,984
Performing Loans, % of Total Gross Loans | 100.00% | 99.90%
Consumer | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-Performing Loans, Amount | $ 28 | $ 91
Non-Performing Loans, % of Total Gross Loans | 0.00% | 0.10%

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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=82891408&loc=d3e4428-111522 + Details
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