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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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- 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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