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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 176,811 | $ 199,545
Unpaid Principal Balance | 190,921 | 214,712
Related Allowance | 2,578 | 3,388
Average Recorded Investment (Year-To-Date) | 187,998 | 228,398
Amount of related allowance included in specific reserves | 376 | 517
Amount of related allowance included in general reserves | 2,202 | 2,871
Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 36,212 | 42,687
Unpaid Principal Balance | 42,441 | 49,425
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 38,947 | 43,292
Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 140,599 | 156,858
Unpaid Principal Balance | 148,480 | 165,287
Related Allowance | 2,578 | 3,388
Average Recorded Investment (Year-To-Date) | 149,051 | 185,106
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 142,354 | 158,668
Unpaid Principal Balance | 146,007 | 163,149
Related Allowance | 2,202 | 2,871
Average Recorded Investment (Year-To-Date) | 150,090 | 181,826
Single-family residential | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 16,089 | 18,872
Unpaid Principal Balance | 16,964 | 20,050
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 16,800 | 20,097
Single-family residential | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 126,265 | 139,796
Unpaid Principal Balance | 129,043 | 143,099
Related Allowance | 2,202 | 2,871
Average Recorded Investment (Year-To-Date) | 133,290 | 161,729
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,532 | 2,698
Unpaid Principal Balance | 1,750 | 2,818
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,953 | 1,349
Construction | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,532 | 2,698
Unpaid Principal Balance | 1,750 | 2,818
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,953 | 1,349
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 0
Unpaid Principal Balance |  | 0
Related Allowance |  | 0
Average Recorded Investment (Year-To-Date) |  | 74
Construction - custom | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 0
Unpaid Principal Balance |  | 0
Related Allowance |  | 0
Average Recorded Investment (Year-To-Date) |  | 74
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 242 | 921
Unpaid Principal Balance | 297 | 971
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 534 | 611
Land - acquisition & development | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 143 | 814
Unpaid Principal Balance | 143 | 814
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 431 | 572
Land - acquisition & development | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 99 | 107
Unpaid Principal Balance | 154 | 157
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 103 | 39
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,624 | 5,227
Unpaid Principal Balance | 5,111 | 5,626
Related Allowance | 7 | 9
Average Recorded Investment (Year-To-Date) | 4,878 | 6,709
Land - consumer lot loans | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 135 | 311
Unpaid Principal Balance | 165 | 336
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 209 | 260
Land - consumer lot loans | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,489 | 4,916
Unpaid Principal Balance | 4,946 | 5,290
Related Allowance | 7 | 9
Average Recorded Investment (Year-To-Date) | 4,669 | 6,449
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 419 | 448
Unpaid Principal Balance | 419 | 448
Related Allowance | 4 | 4
Average Recorded Investment (Year-To-Date) | 434 | 541
Multi-family | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 0
Unpaid Principal Balance |  | 0
Related Allowance |  | 0
Average Recorded Investment (Year-To-Date) |  | 70
Multi-family | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 419 | 448
Unpaid Principal Balance | 419 | 448
Related Allowance | 4 | 4
Average Recorded Investment (Year-To-Date) | 434 | 471
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 13,699 | 15,679
Unpaid Principal Balance | 19,533 | 21,768
Related Allowance | 120 | 150
Average Recorded Investment (Year-To-Date) | 14,959 | 21,603
Commercial real estate | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 8,757 | 9,425
Unpaid Principal Balance | 13,482 | 14,035
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 9,376 | 11,158
Commercial real estate | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,942 | 6,254
Unpaid Principal Balance | 6,051 | 7,733
Related Allowance | 120 | 150
Average Recorded Investment (Year-To-Date) | 5,583 | 10,445
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 12,366 | 14,428
Unpaid Principal Balance | 16,151 | 17,652
Related Allowance | 245 | 354
Average Recorded Investment (Year-To-Date) | 13,607 | 13,703
Commercial & industrial | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,006 | 10,137
Unpaid Principal Balance | 9,321 | 10,146
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 9,670 | 9,208
Commercial & industrial | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,360 | 4,291
Unpaid Principal Balance | 6,830 | 7,506
Related Allowance | 245 | 354
Average Recorded Investment (Year-To-Date) | 3,937 | 4,495
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,488 | 1,386
Unpaid Principal Balance | 1,500 | 2,154
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,454 | 1,845
HELOC | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 528 | 410
Unpaid Principal Balance | 528 | 1,170
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 486 | 450
HELOC | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 960 | 976
Unpaid Principal Balance | 972 | 984
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 968 | 1,395
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 87 | 90
Unpaid Principal Balance | 153 | 126
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 89 | 137
Consumer | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 22 | 20
Unpaid Principal Balance | 88 | 56
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 22 | 54
Consumer | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 65 | 70
Unpaid Principal Balance | 65 | 70
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | $ 67 | $ 83

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