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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | $ 285,243 |  | $ 341,579 |
Unpaid principal balance | 321,743 |  | 381,223 |
Related allowance | 3,915 | [1] | 6,678 | [2]
Average recorded investment | 265,771 |  | 333,815 |
Amount of related allowance included in specific reserves | 366 |  | 275 |
Amount of related allowance included in general reserves | 3,549 |  | 6,403 |
Single-family residential |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 237,813 |  | 276,711 |
Unpaid principal balance | 243,961 |  | 282,912 |
Related allowance | 3,809 |  | 6,678 |
Average recorded investment | 223,143 |  | 274,097 |
Construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 0 |  | 5,441 |
Unpaid principal balance | 0 |  | 7,929 |
Related allowance | 0 |  | 0 |
Average recorded investment | 0 |  | 5,903 |
Construction - custom |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 0 |  | 554 |
Unpaid principal balance | 0 |  | 554 |
Related allowance | 0 |  | 0 |
Average recorded investment | 0 |  | 182 |
Land - acquisition & development |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,292 |  | 5,056 |
Unpaid principal balance | 11,095 |  | 12,852 |
Related allowance | 1 |  | 0 |
Average recorded investment | 2,380 |  | 4,404 |
Land - consumer lot loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 10,129 |  | 12,016 |
Unpaid principal balance | 11,287 |  | 12,368 |
Related allowance | 1 |  | 0 |
Average recorded investment | 9,865 |  | 11,868 |
Multi-family |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,899 |  | 7,593 |
Unpaid principal balance | 5,477 |  | 10,877 |
Related allowance | 13 |  | 0 |
Average recorded investment | 2,160 |  | 5,277 |
Commercial real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 31,175 |  | 28,551 |
Unpaid principal balance | 44,149 |  | 36,698 |
Related allowance | 91 |  | 0 |
Average recorded investment | 25,571 |  | 27,016 |
Commercial & industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,030 |  | 2,955 |
Unpaid principal balance | 3,082 |  | 13,066 |
Related allowance | 0 |  | 0 |
Average recorded investment | 863 |  | 2,681 |
HELOC |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,715 |  | 2,126 |
Unpaid principal balance | 1,836 |  | 2,975 |
Related allowance | 0 |  | 0 |
Average recorded investment | 1,578 |  | 1,895 |
Consumer |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 190 |  | 576 |
Unpaid principal balance | 856 |  | 992 |
Related allowance | 0 |  | 0 |
Average recorded investment | 211 |  | 492 |
No Allowance Recorded |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 23,712 |  | 38,866 |
Unpaid principal balance | 50,196 |  | 70,564 |
Related allowance | 0 |  | 0 |
Average recorded investment | 15,479 |  | 29,474 |
No Allowance Recorded | Single-family residential |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 9,627 |  | 17,250 |
Unpaid principal balance | 11,366 |  | 19,644 |
Related allowance | 0 |  | 0 |
Average recorded investment | 6,511 |  | 14,069 |
No Allowance Recorded | Construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 0 |  | 453 |
Unpaid principal balance | 0 |  | 2,151 |
Related allowance | 0 |  | 0 |
Average recorded investment | 0 |  | 471 |
No Allowance Recorded | Construction - custom |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 0 |  | 554 |
Unpaid principal balance | 0 |  | 554 |
Related allowance | 0 |  | 0 |
Average recorded investment | 0 |  | 182 |
No Allowance Recorded | Land - acquisition & development |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 138 |  | 2,570 |
Unpaid principal balance | 9,001 |  | 9,426 |
Related allowance | 0 |  | 0 |
Average recorded investment | 614 |  | 926 |
No Allowance Recorded | Land - consumer lot loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 499 |  | 727 |
Unpaid principal balance | 609 |  | 814 |
Related allowance | 0 |  | 0 |
Average recorded investment | 317 |  | 544 |
No Allowance Recorded | Multi-family |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 394 |  | 3,770 |
Unpaid principal balance | 3,972 |  | 7,054 |
Related allowance | 0 |  | 0 |
Average recorded investment | 638 |  | 1,545 |
No Allowance Recorded | Commercial real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 11,741 |  | 9,427 |
Unpaid principal balance | 21,301 |  | 15,620 |
Related allowance | 0 |  | 0 |
Average recorded investment | 6,260 |  | 8,130 |
No Allowance Recorded | Commercial & industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,030 |  | 2,955 |
Unpaid principal balance | 3,082 |  | 13,066 |
Related allowance | 0 |  | 0 |
Average recorded investment | 863 |  | 2,681 |
No Allowance Recorded | HELOC |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 209 |  | 683 |
Unpaid principal balance | 315 |  | 1,532 |
Related allowance | 0 |  | 0 |
Average recorded investment | 165 |  | 536 |
No Allowance Recorded | Consumer |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 74 |  | 477 |
Unpaid principal balance | 550 |  | 703 |
Related allowance | 0 |  | 0 |
Average recorded investment | 111 |  | 390 |
Allowance Recorded |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 261,531 |  | 302,713 |
Unpaid principal balance | 271,547 |  | 310,659 |
Related allowance | 3,915 | [1] | 6,678 | [2]
Average recorded investment | 250,292 |  | 304,341 |
Allowance Recorded | Single-family residential |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 228,186 |  | 259,461 |
Unpaid principal balance | 232,595 |  | 263,268 |
Related allowance | 3,809 |  | 6,678 |
Average recorded investment | 216,632 |  | 260,028 |
Allowance Recorded | Construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 0 |  | 4,988 |
Unpaid principal balance | 0 |  | 5,778 |
Related allowance | 0 |  | 0 |
Average recorded investment | 0 |  | 5,432 |
Allowance Recorded | Construction - custom |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 0 |  | 0 |
Unpaid principal balance | 0 |  | 0 |
Related allowance | 0 |  | 0 |
Average recorded investment | 0 |  | 0 |
Allowance Recorded | Land - acquisition & development |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,154 |  | 2,486 |
Unpaid principal balance | 2,094 |  | 3,426 |
Related allowance | 1 |  | 0 |
Average recorded investment | 1,766 |  | 3,478 |
Allowance Recorded | Land - consumer lot loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 9,630 |  | 11,289 |
Unpaid principal balance | 10,678 |  | 11,554 |
Related allowance | 1 |  | 0 |
Average recorded investment | 9,548 |  | 11,324 |
Allowance Recorded | Multi-family |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,505 |  | 3,823 |
Unpaid principal balance | 1,505 |  | 3,823 |
Related allowance | 13 |  | 0 |
Average recorded investment | 1,522 |  | 3,732 |
Allowance Recorded | Commercial real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 19,434 |  | 19,124 |
Unpaid principal balance | 22,848 |  | 21,078 |
Related allowance | 91 |  | 0 |
Average recorded investment | 19,311 |  | 18,886 |
Allowance Recorded | Commercial & industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 0 |  | 0 |
Unpaid principal balance | 0 |  | 0 |
Related allowance | 0 |  | 0 |
Average recorded investment | 0 |  | 0 |
Allowance Recorded | HELOC |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 1,506 |  | 1,443 |
Unpaid principal balance | 1,521 |  | 1,443 |
Related allowance | 0 |  | 0 |
Average recorded investment | 1,413 |  | 1,359 |
Allowance Recorded | Consumer |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded investment | 116 |  | 99 |
Unpaid principal balance | 306 |  | 289 |
Related allowance | 0 |  | 0 |
Average recorded investment | $ 100 |  | $ 102 |
[1] | Includes $366,000 of specific reserves and $3,549,000 included in the general reserves.
[2] | Includes $275,000 of specific reserves and $6,403,000 included in the general reserves.

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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