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Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 123,073 | $ 113,494 | $ 106,829
Recorded investment of loans | 12,201,387 | 10,950,608 |
Single-family residential |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 36,892 | 37,796 | 47,347
Recorded investment of loans | 5,711,004 | 5,658,830 |
Construction |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 24,556 | 19,838 | 6,680
Recorded investment of loans | 1,597,996 | 1,110,411 |
Construction - custom |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 1,944 | 1,080 | 990
Recorded investment of loans | 602,631 | 473,069 |
Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 6,829 | 6,023 | 5,781
Recorded investment of loans | 124,308 | 118,497 |
Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 2,649 | 2,535 | 2,946
Recorded investment of loans | 104,405 | 104,567 |
Multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 7,862 | 6,925 | 5,304
Recorded investment of loans | 1,303,148 | 1,124,290 |
Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 11,818 | 8,588 | 8,960
Recorded investment of loans | 1,434,610 | 1,093,639 |
Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 28,524 | 28,008 | 24,980
Recorded investment of loans | 1,093,360 | 978,589 |
HELOC |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 855 | 813 | 902
Recorded investment of loans | 144,850 | 149,716 |
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 1,144 | 1,888 | $ 2,939
Recorded investment of loans | 85,075 | 139,000 |
Loans Collectively Evaluated for Impairment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 122,947 | 113,128 |
Recorded investment of loans | $ 11,000,212 | $ 9,784,140 |
Ratio | 1.10% | 1.20% |
Loans Collectively Evaluated for Impairment | Single-family residential |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 36,893 | $ 37,536 |
Recorded investment of loans | $ 5,713,576 | $ 5,585,912 |
Ratio | 0.70% | 0.70% |
Loans Collectively Evaluated for Impairment | Construction |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 24,556 | $ 19,838 |
Recorded investment of loans | $ 793,958 | $ 498,450 |
Ratio | 3.10% | 4.00% |
Loans Collectively Evaluated for Impairment | Construction - custom |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 1,944 | $ 1,080 |
Recorded investment of loans | $ 277,495 | $ 229,298 |
Ratio | 0.70% | 0.50% |
Loans Collectively Evaluated for Impairment | Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 6,828 | $ 6,022 |
Recorded investment of loans | $ 104,767 | $ 90,850 |
Ratio | 6.50% | 6.60% |
Loans Collectively Evaluated for Impairment | Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 2,649 | $ 2,535 |
Recorded investment of loans | $ 96,337 | $ 92,828 |
Ratio | 2.80% | 2.70% |
Loans Collectively Evaluated for Impairment | Multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 7,857 | $ 6,911 |
Recorded investment of loans | $ 1,302,625 | $ 1,091,974 |
Ratio | 0.60% | 0.60% |
Loans Collectively Evaluated for Impairment | Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 11,697 | $ 8,497 |
Recorded investment of loans | $ 1,391,668 | $ 957,380 |
Ratio | 0.80% | 0.90% |
Loans Collectively Evaluated for Impairment | Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 28,524 | $ 28,008 |
Recorded investment of loans | $ 1,093,210 | $ 966,930 |
Ratio | 2.60% | 2.90% |
Loans Collectively Evaluated for Impairment | HELOC |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 855 | $ 813 |
Recorded investment of loans | $ 141,689 | $ 133,203 |
Ratio | 0.60% | 0.60% |
Loans Collectively Evaluated for Impairment | Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 1,144 | $ 1,888 |
Recorded investment of loans | $ 84,887 | $ 137,315 |
Ratio | 1.40% | 1.40% |
Loans Individually Evaluated for Impairment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 126 | $ 366 |
Recorded investment of loans | $ 28,553 | $ 34,271 |
Ratio | 0.40% | 1.10% |
Loans Individually Evaluated for Impairment | Single-family residential |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 260 |
Recorded investment of loans | $ 5,552 | $ 19,629 |
Ratio | 0.00% | 1.30% |
Loans Individually Evaluated for Impairment | Construction |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 0 |
Recorded investment of loans | $ 0 | $ 0 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Construction - custom |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 0 |
Recorded investment of loans | $ 105 | $ 330 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 1 | $ 2 |
Recorded investment of loans | $ 89 | $ 850 |
Ratio | 1.00% | 0.20% |
Loans Individually Evaluated for Impairment | Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 0 |
Recorded investment of loans | $ 171 | $ 558 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 5 | $ 13 |
Recorded investment of loans | $ 493 | $ 1,505 |
Ratio | 1.00% | 0.90% |
Loans Individually Evaluated for Impairment | Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 120 | $ 91 |
Recorded investment of loans | $ 21,765 | $ 11,157 |
Ratio | 0.60% | 0.80% |
Loans Individually Evaluated for Impairment | Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 0 |
Recorded investment of loans | $ 81 | $ 0 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | HELOC |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 0 |
Recorded investment of loans | $ 215 | $ 239 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 0 |
Recorded investment of loans | $ 82 | $ 3 |
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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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