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Allowance for Loan Losses - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 131,534 | $ 129,257 | $ 123,073
Recorded Investment of Loans | 13,312,388 | 12,853,678 |
Single-family residential |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 30,988 | 33,033 | 36,892
Recorded Investment of Loans | 5,835,194 | 5,798,966 |
Construction |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 32,304 | 31,317 | 24,556
Recorded Investment of Loans | 2,038,052 | 1,890,668 |
Construction - custom |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 1,369 | 1,842 | 1,944
Recorded Investment of Loans | 540,741 | 624,479 |
Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 9,155 | 7,978 | 6,829
Recorded Investment of Loans | 204,107 | 155,204 |
Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 2,143 | 2,164 | 2,649
Recorded Investment of Loans | 99,694 | 102,036 |
Multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 7,391 | 8,329 | 7,862
Recorded Investment of Loans | 1,422,674 | 1,385,125 |
Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 13,170 | 11,852 | 11,818
Recorded Investment of Loans | 1,631,170 | 1,452,168 |
Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 31,450 | 28,702 | 28,524
Recorded Investment of Loans | 1,268,695 | 1,140,874 |
HELOC |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 1,103 | 781 | 855
Recorded Investment of Loans | 142,178 | 130,852 |
Consumer |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 2,461 | 3,259 | $ 1,144
Recorded Investment of Loans | 129,883 | 173,306 |
Loans Collectively Evaluated for Impairment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | 131,095 | 128,740 |
Recorded Investment of Loans | $ 12,076,622 | $ 11,597,492 |
Ratio | 1.10% | 1.10% |
Loans Collectively Evaluated for Impairment | Single-family residential |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 30,988 | $ 33,033 |
Recorded Investment of Loans | $ 5,822,200 | $ 5,782,870 |
Ratio | 0.50% | 0.60% |
Loans Collectively Evaluated for Impairment | Construction |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 32,304 | $ 31,317 |
Recorded Investment of Loans | $ 1,164,889 | $ 1,060,428 |
Ratio | 2.80% | 3.00% |
Loans Collectively Evaluated for Impairment | Construction - custom |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 1,369 | $ 1,842 |
Recorded Investment of Loans | $ 255,505 | $ 289,192 |
Ratio | 0.50% | 0.60% |
Loans Collectively Evaluated for Impairment | Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 9,135 | $ 7,969 |
Recorded Investment of Loans | $ 160,964 | $ 122,639 |
Ratio | 5.70% | 6.50% |
Loans Collectively Evaluated for Impairment | Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 2,143 | $ 2,164 |
Recorded Investment of Loans | $ 95,574 | $ 96,583 |
Ratio | 2.20% | 2.20% |
Loans Collectively Evaluated for Impairment | Multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 7,387 | $ 8,325 |
Recorded Investment of Loans | $ 1,422,266 | $ 1,384,655 |
Ratio | 0.50% | 0.60% |
Loans Collectively Evaluated for Impairment | Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 12,847 | $ 11,702 |
Recorded Investment of Loans | $ 1,618,406 | $ 1,432,791 |
Ratio | 0.80% | 0.80% |
Loans Collectively Evaluated for Impairment | Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 31,358 | $ 28,348 |
Recorded Investment of Loans | $ 1,266,913 | $ 1,126,438 |
Ratio | 2.50% | 2.50% |
Loans Collectively Evaluated for Impairment | HELOC |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 1,103 | $ 781 |
Recorded Investment of Loans | $ 140,378 | $ 128,715 |
Ratio | 0.80% | 0.60% |
Loans Collectively Evaluated for Impairment | Consumer |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 2,461 | $ 3,259 |
Recorded Investment of Loans | $ 129,527 | $ 173,181 |
Ratio | 1.90% | 1.90% |
Loans Individually Evaluated for Impairment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 439 | $ 517 |
Recorded Investment of Loans | $ 34,425 | $ 60,680 |
Ratio | 1.30% | 0.90% |
Loans Individually Evaluated for Impairment | Single-family residential |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 17,978 | $ 21,345 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Construction |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 0 | $ 2,427 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Construction - custom |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 0 | $ 0 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Land - acquisition & development |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 20 | $ 9 |
Recorded Investment of Loans | $ 230 | $ 920 |
Ratio | 8.70% | 1.00% |
Loans Individually Evaluated for Impairment | Land - consumer lot loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 375 | $ 507 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 4 | $ 4 |
Recorded Investment of Loans | $ 385 | $ 448 |
Ratio | 1.00% | 1.00% |
Loans Individually Evaluated for Impairment | Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 323 | $ 150 |
Recorded Investment of Loans | $ 12,765 | $ 19,378 |
Ratio | 2.50% | 0.80% |
Loans Individually Evaluated for Impairment | Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 92 | $ 354 |
Recorded Investment of Loans | $ 1,805 | $ 14,437 |
Ratio | 5.10% | 2.50% |
Loans Individually Evaluated for Impairment | HELOC |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 837 | $ 1,162 |
Ratio | 0.00% | 0.00% |
Loans Individually Evaluated for Impairment | Consumer |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance Reserve Allocation | $ 0 | $ 0 |
Recorded Investment of Loans | $ 50 | $ 56 |
Ratio | 0.00% | 0.00% |

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + 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=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + 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=118952595&loc=d3e4428-111522 + Details
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