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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 199,545 | $ 251,274
Unpaid Principal Balance | 214,712 | 289,340
Related Allowance | 3,388 | 4,156
Average Recorded Investment | 228,398 | 274,530
Amount of related allowance included in specific reserves | 517 | 126
Amount of related allowance included in general reserves | 2,871 | 4,030
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 158,668 | 203,266
Unpaid Principal Balance | 163,149 | 210,047
Related Allowance | 2,871 | 4,030
Average Recorded Investment | 181,826 | 224,094
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,698 |
Unpaid Principal Balance | 2,818 |
Related Allowance | 0 |
Average Recorded Investment | 1,349 |
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 148
Unpaid Principal Balance | 0 | 165
Related Allowance | 0 | 0
Average Recorded Investment | 74 | 231
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 921 | 420
Unpaid Principal Balance | 971 | 8,298
Related Allowance | 0 | 1
Average Recorded Investment | 611 | 752
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,227 | 8,157
Unpaid Principal Balance | 5,626 | 8,856
Related Allowance | 9 | 0
Average Recorded Investment | 6,709 | 9,407
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 448 | 632
Unpaid Principal Balance | 448 | 3,724
Related Allowance | 4 | 5
Average Recorded Investment | 541 | 1,772
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 15,679 | 27,969
Unpaid Principal Balance | 21,768 | 39,194
Related Allowance | 150 | 120
Average Recorded Investment | 21,603 | 28,457
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 14,428 | 8,279
Unpaid Principal Balance | 17,652 | 14,321
Related Allowance | 354 | 0
Average Recorded Investment | 13,703 | 7,722
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,386 | 2,218
Unpaid Principal Balance | 2,154 | 3,018
Related Allowance | 0 | 0
Average Recorded Investment | 1,845 | 1,938
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 90 | 185
Unpaid Principal Balance | 126 | 1,717
Related Allowance | 0 | 0
Average Recorded Investment | 137 | 157
Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 42,687 | 43,897
Unpaid Principal Balance | 49,425 | 75,267
Related Allowance | 0 | 0
Average Recorded Investment | 43,292 | 40,392
Impaired loans with no related allowance recorded | Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 18,872 | 21,325
Unpaid Principal Balance | 20,050 | 23,880
Related Allowance | 0 | 0
Average Recorded Investment | 20,097 | 19,371
Impaired loans with no related allowance recorded | Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,698 |
Unpaid Principal Balance | 2,818 |
Related Allowance | 0 |
Average Recorded Investment | 1,349 |
Impaired loans with no related allowance recorded | Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 148
Unpaid Principal Balance | 0 | 165
Related Allowance | 0 | 0
Average Recorded Investment | 74 | 231
Impaired loans with no related allowance recorded | Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 814 | 330
Unpaid Principal Balance | 814 | 8,208
Related Allowance | 0 | 0
Average Recorded Investment | 572 | 176
Impaired loans with no related allowance recorded | Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 311 | 208
Unpaid Principal Balance | 336 | 330
Related Allowance | 0 | 0
Average Recorded Investment | 260 | 431
Impaired loans with no related allowance recorded | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 139
Unpaid Principal Balance | 0 | 3,231
Related Allowance | 0 | 0
Average Recorded Investment | 70 | 748
Impaired loans with no related allowance recorded | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,425 | 12,890
Unpaid Principal Balance | 14,035 | 22,487
Related Allowance | 0 | 0
Average Recorded Investment | 11,158 | 11,466
Impaired loans with no related allowance recorded | Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 10,137 | 8,279
Unpaid Principal Balance | 10,146 | 14,321
Related Allowance | 0 | 0
Average Recorded Investment | 9,208 | 7,425
Impaired loans with no related allowance recorded | HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 410 | 490
Unpaid Principal Balance | 1,170 | 1,212
Related Allowance | 0 | 0
Average Recorded Investment | 450 | 487
Impaired loans with no related allowance recorded | Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 20 | 88
Unpaid Principal Balance | 56 | 1,433
Related Allowance | 0 | 0
Average Recorded Investment | 54 | 57
Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 156,858 | 207,377
Unpaid Principal Balance | 165,287 | 214,073
Related Allowance | 3,388 | 4,156
Average Recorded Investment | 185,106 | 234,138
Impaired loans with an allowance recorded | Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 139,796 | 181,941
Unpaid Principal Balance | 143,099 | 186,167
Related Allowance | 2,871 | 4,030
Average Recorded Investment | 161,729 | 204,723
Impaired loans with an allowance recorded | Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 107 | 90
Unpaid Principal Balance | 157 | 90
Related Allowance | 0 | 1
Average Recorded Investment | 39 | 576
Impaired loans with an allowance recorded | Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,916 | 7,949
Unpaid Principal Balance | 5,290 | 8,526
Related Allowance | 9 | 0
Average Recorded Investment | 6,449 | 8,976
Impaired loans with an allowance recorded | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 448 | 493
Unpaid Principal Balance | 448 | 493
Related Allowance | 4 | 5
Average Recorded Investment | 471 | 1,024
Impaired loans with an allowance recorded | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 6,254 | 15,079
Unpaid Principal Balance | 7,733 | 16,707
Related Allowance | 150 | 120
Average Recorded Investment | 10,445 | 16,991
Impaired loans with an allowance recorded | Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,291 | 0
Unpaid Principal Balance | 7,506 | 0
Related Allowance | 354 | 0
Average Recorded Investment | 4,495 | 297
Impaired loans with an allowance recorded | HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 976 | 1,728
Unpaid Principal Balance | 984 | 1,806
Related Allowance | 0 | 0
Average Recorded Investment | 1,395 | 1,451
Impaired loans with an allowance recorded | Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 70 | 97
Unpaid Principal Balance | 70 | 284
Related Allowance | 0 | 0
Average Recorded Investment | $ 83 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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