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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 162,395 | $ 199,545
Unpaid Principal Balance | 178,085 | 214,712
Related Allowance | 2,496 | 3,388
Average Recorded Investment (Year-To-Date) | 181,598 | 228,398
Amount of related allowance included in specific reserves | 331 | 517
Amount of related allowance included in general reserves | 2,165 | 2,871
Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 33,538 | 42,687
Unpaid Principal Balance | 44,714 | 49,425
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 37,595 | 43,292
Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 128,857 | 156,858
Unpaid Principal Balance | 133,371 | 165,287
Related Allowance | 2,496 | 3,388
Average Recorded Investment (Year-To-Date) | 144,003 | 185,106
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 133,012 | 158,668
Unpaid Principal Balance | 137,125 | 163,149
Related Allowance | 2,165 | 2,871
Average Recorded Investment (Year-To-Date) | 145,820 | 181,826
Single-family residential | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 15,045 | 18,872
Unpaid Principal Balance | 16,340 | 20,050
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 16,361 | 20,097
Single-family residential | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 117,967 | 139,796
Unpaid Principal Balance | 120,785 | 143,099
Related Allowance | 2,165 | 2,871
Average Recorded Investment (Year-To-Date) | 129,459 | 161,729
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 2,698
Unpaid Principal Balance | 0 | 2,818
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,465 | 1,349
Construction | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 2,698
Unpaid Principal Balance | 0 | 2,818
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,465 | 1,349
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,257 | 0
Unpaid Principal Balance | 1,257 | 0
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 314 | 74
Construction - custom | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,257 | 0
Unpaid Principal Balance | 1,257 | 0
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 314 | 74
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 173 | 921
Unpaid Principal Balance | 296 | 971
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 444 | 611
Land - acquisition & development | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 78 | 814
Unpaid Principal Balance | 143 | 814
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 343 | 572
Land - acquisition & development | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 95 | 107
Unpaid Principal Balance | 153 | 157
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 101 | 39
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,522 | 5,227
Unpaid Principal Balance | 4,971 | 5,626
Related Allowance | 17 | 9
Average Recorded Investment (Year-To-Date) | 4,789 | 6,709
Land - consumer lot loans | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 466 | 311
Unpaid Principal Balance | 499 | 336
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 273 | 260
Land - consumer lot loans | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,056 | 4,916
Unpaid Principal Balance | 4,472 | 5,290
Related Allowance | 17 | 9
Average Recorded Investment (Year-To-Date) | 4,516 | 6,449
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,833 | 448
Unpaid Principal Balance | 1,833 | 448
Related Allowance | 4 | 4
Average Recorded Investment (Year-To-Date) | 784 | 541
Multi-family | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,431 | 0
Unpaid Principal Balance | 1,431 | 0
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 358 | 70
Multi-family | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 402 | 448
Unpaid Principal Balance | 402 | 448
Related Allowance | 4 | 4
Average Recorded Investment (Year-To-Date) | 426 | 471
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 13,736 | 15,679
Unpaid Principal Balance | 20,322 | 21,768
Related Allowance | 232 | 150
Average Recorded Investment (Year-To-Date) | 14,653 | 21,603
Commercial real estate | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 8,854 | 9,425
Unpaid Principal Balance | 14,320 | 14,035
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 9,245 | 11,158
Commercial real estate | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,882 | 6,254
Unpaid Principal Balance | 6,002 | 7,733
Related Allowance | 232 | 150
Average Recorded Investment (Year-To-Date) | 5,408 | 10,445
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 6,155 | 14,428
Unpaid Principal Balance | 10,433 | 17,652
Related Allowance | 78 | 354
Average Recorded Investment (Year-To-Date) | 11,745 | 13,703
Commercial & industrial | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,715 | 10,137
Unpaid Principal Balance | 9,904 | 10,146
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 8,682 | 9,208
Commercial & industrial | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 440 | 4,291
Unpaid Principal Balance | 529 | 7,506
Related Allowance | 78 | 354
Average Recorded Investment (Year-To-Date) | 3,063 | 4,495
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,645 | 1,386
Unpaid Principal Balance | 1,751 | 2,154
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,501 | 1,845
HELOC | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 692 | 410
Unpaid Principal Balance | 785 | 1,170
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 537 | 450
HELOC | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 953 | 976
Unpaid Principal Balance | 966 | 984
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 964 | 1,395
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 62 | 90
Unpaid Principal Balance | 97 | 126
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 83 | 137
Consumer | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 20
Unpaid Principal Balance | 35 | 56
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 17 | 54
Consumer | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 62 | 70
Unpaid Principal Balance | 62 | 70
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | $ 66 | $ 83

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