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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | $ 251,274 | $ 285,243
Unpaid principal balance | 289,340 | 321,743
Related allowance | 4,156 | 3,915
Average recorded investment | 274,530 | 301,685
Amount of related allowance included in specific reserves | 126 | 366
Amount of related allowance included in general reserves | 4,030 | 3,549
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 203,266 | 237,813
Unpaid principal balance | 210,047 | 243,961
Related allowance | 4,030 | 3,809
Average recorded investment | 224,094 | 250,805
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 0 | 0
Unpaid principal balance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 0 | 1,089
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 148 | 0
Unpaid principal balance | 165 | 0
Related allowance | 0 | 0
Average recorded investment | 231 | 603
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 420 | 1,292
Unpaid principal balance | 8,298 | 11,095
Related allowance | 1 | 1
Average recorded investment | 752 | 2,485
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 8,157 | 10,129
Unpaid principal balance | 8,856 | 11,287
Related allowance | 0 | 1
Average recorded investment | 9,407 | 10,917
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 632 | 1,899
Unpaid principal balance | 3,724 | 5,477
Related allowance | 5 | 13
Average recorded investment | 1,772 | 3,438
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 27,969 | 31,175
Unpaid principal balance | 39,194 | 44,149
Related allowance | 120 | 91
Average recorded investment | 28,457 | 28,992
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 8,279 | 1,030
Unpaid principal balance | 14,321 | 3,082
Related allowance | 0 | 0
Average recorded investment | 7,722 | 1,205
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 2,218 | 1,715
Unpaid principal balance | 3,018 | 1,836
Related allowance | 0 | 0
Average recorded investment | 1,938 | 1,815
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 185 | 190
Unpaid principal balance | 1,717 | 856
Related allowance | 0 | 0
Average recorded investment | 157 | 336
Scenario, Previously Reported |  |
Financing Receivable, Impaired [Line Items] |  |
Average recorded investment |  | 265,771
No Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 43,897 | 23,712
Unpaid principal balance | 75,267 | 50,196
Related allowance | 0 | 0
Average recorded investment | 40,392 | 25,725
No Allowance Recorded | Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 21,325 | 9,627
Unpaid principal balance | 23,880 | 11,366
Related allowance | 0 | 0
Average recorded investment | 19,371 | 12,618
No Allowance Recorded | Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 0 | 0
Unpaid principal balance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 0 | 91
No Allowance Recorded | Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 148 | 0
Unpaid principal balance | 165 | 0
Related allowance | 0 | 0
Average recorded investment | 231 | 603
No Allowance Recorded | Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 330 | 138
Unpaid principal balance | 8,208 | 9,001
Related allowance | 0 | 0
Average recorded investment | 176 | 720
No Allowance Recorded | Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 208 | 499
Unpaid principal balance | 330 | 609
Related allowance | 0 | 0
Average recorded investment | 431 | 587
No Allowance Recorded | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 139 | 394
Unpaid principal balance | 3,231 | 3,972
Related allowance | 0 | 0
Average recorded investment | 748 | 1,279
No Allowance Recorded | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 12,890 | 11,741
Unpaid principal balance | 22,487 | 21,301
Related allowance | 0 | 0
Average recorded investment | 11,466 | 7,994
No Allowance Recorded | Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 8,279 | 1,030
Unpaid principal balance | 14,321 | 3,082
Related allowance | 0 | 0
Average recorded investment | 7,425 | 1,205
No Allowance Recorded | HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 490 | 209
Unpaid principal balance | 1,212 | 315
Related allowance | 0 | 0
Average recorded investment | 487 | 392
No Allowance Recorded | Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 88 | 74
Unpaid principal balance | 1,433 | 550
Related allowance | 0 | 0
Average recorded investment | 57 | 236
Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 207,377 | 261,531
Unpaid principal balance | 214,073 | 271,547
Related allowance | 4,156 | 3,915
Average recorded investment | 234,138 | 275,960
Allowance Recorded | Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 181,941 | 228,186
Unpaid principal balance | 186,167 | 232,595
Related allowance | 4,030 | 3,809
Average recorded investment | 204,723 | 238,187
Allowance Recorded | Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 0 | 0
Unpaid principal balance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 0 | 998
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 | 90 | 1,154
Unpaid principal balance | 90 | 2,094
Related allowance | 1 | 1
Average recorded investment | 576 | 1,765
Allowance Recorded | Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 7,949 | 9,630
Unpaid principal balance | 8,526 | 10,678
Related allowance | 0 | 1
Average recorded investment | 8,976 | 10,330
Allowance Recorded | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 493 | 1,505
Unpaid principal balance | 493 | 1,505
Related allowance | 5 | 13
Average recorded investment | 1,024 | 2,159
Allowance Recorded | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 15,079 | 19,434
Unpaid principal balance | 16,707 | 22,848
Related allowance | 120 | 91
Average recorded investment | 16,991 | 20,998
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 | 297 | 0
Allowance Recorded | HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 1,728 | 1,506
Unpaid principal balance | 1,806 | 1,521
Related allowance | 0 | 0
Average recorded investment | 1,451 | 1,423
Allowance Recorded | Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | 97 | 116
Unpaid principal balance | 284 | 306
Related allowance | 0 | 0
Average recorded investment | $ 100 | $ 100

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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=84173941&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=84173941&loc=SL6953423-111524 + Details
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