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Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 129,257 | $ 123,073 | $ 113,494
Recorded Investment of Loans | 12,853,678 | 12,201,387 |
Single-family residential |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 33,033 | 36,892 | 37,796
Recorded Investment of Loans | 5,798,966 | 5,711,004 |
Construction |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 31,317 | 24,556 | 19,838
Recorded Investment of Loans | 1,890,668 | 1,597,996 |
Construction - custom |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 1,842 | 1,944 | 1,080
Recorded Investment of Loans | 624,479 | 602,631 |
Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 7,978 | 6,829 | 6,023
Recorded Investment of Loans | 155,204 | 124,308 |
Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 2,164 | 2,649 | 2,535
Recorded Investment of Loans | 102,036 | 104,405 |
Multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 8,329 | 7,862 | 6,925
Recorded Investment of Loans | 1,385,125 | 1,303,148 |
Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 11,852 | 11,818 | 8,588
Recorded Investment of Loans | 1,452,168 | 1,434,610 |
Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 28,702 | 28,524 | 28,008
Recorded Investment of Loans | 1,140,874 | 1,093,360 |
HELOC |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 781 | 855 | 813
Recorded Investment of Loans | 130,852 | 144,850 |
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 3,259 | 1,144 | $ 1,888
Recorded Investment of Loans | 173,306 | 85,075 |
Loans Collectively Evaluated for Impairment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | 128,740 | 122,947 |
Recorded Investment of Loans | $ 11,597,492 | $ 11,000,212 |
Ratio | 1.10% | 1.10% |
Loans Collectively Evaluated for Impairment | Single-family residential |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 33,033 | $ 36,892 |
Recorded Investment of Loans | $ 5,782,870 | $ 5,713,576 |
Ratio | 0.60% | 0.70% |
Loans Collectively Evaluated for Impairment | Construction |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 31,317 | $ 24,556 |
Recorded Investment of Loans | $ 1,060,428 | $ 793,958 |
Ratio | 3.00% | 3.10% |
Loans Collectively Evaluated for Impairment | Construction - custom |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 1,842 | $ 1,944 |
Recorded Investment of Loans | $ 289,192 | $ 277,495 |
Ratio | 0.60% | 0.70% |
Loans Collectively Evaluated for Impairment | Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 7,969 | $ 6,828 |
Recorded Investment of Loans | $ 122,639 | $ 104,767 |
Ratio | 6.50% | 6.50% |
Loans Collectively Evaluated for Impairment | Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 2,164 | $ 2,649 |
Recorded Investment of Loans | $ 96,583 | $ 96,337 |
Ratio | 2.20% | 2.80% |
Loans Collectively Evaluated for Impairment | Multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 8,325 | $ 7,857 |
Recorded Investment of Loans | $ 1,384,655 | $ 1,302,625 |
Ratio | 0.60% | 0.60% |
Loans Collectively Evaluated for Impairment | Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 11,702 | $ 11,698 |
Recorded Investment of Loans | $ 1,432,791 | $ 1,391,668 |
Ratio | 0.80% | 0.80% |
Loans Collectively Evaluated for Impairment | Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 28,348 | $ 28,524 |
Recorded Investment of Loans | $ 1,126,438 | $ 1,093,210 |
Ratio | 2.50% | 2.60% |
Loans Collectively Evaluated for Impairment | HELOC |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 781 | $ 855 |
Recorded Investment of Loans | $ 128,715 | $ 141,689 |
Ratio | 0.60% | 0.60% |
Loans Collectively Evaluated for Impairment | Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 3,259 | $ 1,144 |
Recorded Investment of Loans | $ 173,181 | $ 84,887 |
Ratio | 1.90% | 1.40% |
Loans Individually Evaluated for Impairment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 517 | $ 126 |
Recorded Investment of Loans | $ 60,680 | $ 28,553 |
Ratio | 0.90% | 0.40% |
Loans Individually Evaluated for Impairment | Single-family residential |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 21,345 | $ 5,552 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Construction |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 2,427 | $ 0 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Construction - custom |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 0 | $ 105 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 9 | $ 1 |
Recorded Investment of Loans | $ 920 | $ 89 |
Ratio | 1.00% | 1.00% |
Loans Individually Evaluated for Impairment | Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 507 | $ 171 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 4 | $ 5 |
Recorded Investment of Loans | $ 448 | $ 493 |
Ratio | 1.00% | 1.00% |
Loans Individually Evaluated for Impairment | Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 150 | $ 120 |
Recorded Investment of Loans | $ 19,378 | $ 21,765 |
Ratio | 0.80% | 0.60% |
Loans Individually Evaluated for Impairment | Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 354 | $ 0 |
Recorded Investment of Loans | $ 14,437 | $ 81 |
Ratio | 2.50% | 0.00% |
Loans Individually Evaluated for Impairment | HELOC |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 1,162 | $ 215 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 56 | $ 82 |
Ratio | 0.00% | 0.00% |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition Allowance as a Percentage of Outstanding Loans and Leases + References No definition available. + Details
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