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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, 2020 | Sep. 30, 2019
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 132,925 | $ 149,546
Unpaid Principal Balance | 140,917 | 164,561
Related Allowance | 1,106 | 2,647
Average Recorded Investment (Year-To-Date) | 139,377 | 175,187
Amount of related allowance included in specific reserves | 9 | 439
Amount of related allowance included in general reserves | 1,097 | 2,208
Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 28,906 | 27,869
Unpaid Principal Balance | 34,240 | 38,486
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 27,202 | 35,649
Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 104,019 | 121,677
Unpaid Principal Balance | 106,677 | 126,075
Related Allowance | 1,106 | 2,647
Average Recorded Investment (Year-To-Date) | 112,175 | 139,538
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 113,547 | 130,021
Unpaid Principal Balance | 116,757 | 133,861
Related Allowance | 1,097 | 2,208
Average Recorded Investment (Year-To-Date) | 120,745 | 142,661
Single-family residential | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 16,523 | 17,979
Unpaid Principal Balance | 17,440 | 19,252
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 17,002 | 16,685
Single-family residential | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 97,024 | 112,042
Unpaid Principal Balance | 99,317 | 114,609
Related Allowance | 1,097 | 2,208
Average Recorded Investment (Year-To-Date) | 103,743 | 125,976
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,434 | 0
Unpaid Principal Balance | 3,434 | 0
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,145 | 1,172
Construction | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,434 | 0
Unpaid Principal Balance | 3,434 | 0
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,145 | 1,172
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 0
Unpaid Principal Balance |  | 0
Related Allowance |  | 0
Average Recorded Investment (Year-To-Date) |  | 251
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) |  | 251
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 82 | 169
Unpaid Principal Balance | 149 | 295
Related Allowance | 1 | 0
Average Recorded Investment (Year-To-Date) | 112 | 389
Land - acquisition & development | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 78
Unpaid Principal Balance | 0 | 143
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 26 | 290
Land - acquisition & development | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 82 | 91
Unpaid Principal Balance | 149 | 152
Related Allowance | 1 | 0
Average Recorded Investment (Year-To-Date) | 86 | 99
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,698 | 3,900
Unpaid Principal Balance | 3,933 | 4,543
Related Allowance | 0 | 20
Average Recorded Investment (Year-To-Date) | 3,808 | 4,611
Land - consumer lot loans | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 280 | 344
Unpaid Principal Balance | 350 | 848
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 298 | 287
Land - consumer lot loans | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,418 | 3,556
Unpaid Principal Balance | 3,583 | 3,695
Related Allowance | 0 | 20
Average Recorded Investment (Year-To-Date) | 3,510 | 4,324
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 316 | 385
Unpaid Principal Balance | 316 | 385
Related Allowance | 1 | 4
Average Recorded Investment (Year-To-Date) | 360 | 704
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) |  | 286
Multi-family | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 316 | 385
Unpaid Principal Balance | 316 | 385
Related Allowance | 1 | 4
Average Recorded Investment (Year-To-Date) | 360 | 418
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,295 | 11,635
Unpaid Principal Balance | 13,636 | 17,179
Related Allowance | 4 | 323
Average Recorded Investment (Year-To-Date) | 10,472 | 14,050
Commercial real estate | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,412 | 7,467
Unpaid Principal Balance | 11,753 | 11,881
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 7,376 | 8,890
Commercial real estate | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,883 | 4,168
Unpaid Principal Balance | 1,883 | 5,298
Related Allowance | 4 | 323
Average Recorded Investment (Year-To-Date) | 3,096 | 5,160
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 855 | 1,540
Unpaid Principal Balance | 978 | 6,003
Related Allowance | 3 | 92
Average Recorded Investment (Year-To-Date) | 1,081 | 9,703
Commercial & industrial | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 458 | 1,114
Unpaid Principal Balance | 464 | 5,312
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 670 | 7,168
Commercial & industrial | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 397 | 426
Unpaid Principal Balance | 514 | 691
Related Allowance | 3 | 92
Average Recorded Investment (Year-To-Date) | 411 | 2,535
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,642 | 1,786
Unpaid Principal Balance | 1,658 | 1,894
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,579 | 1,558
HELOC | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 799 | 837
Unpaid Principal Balance | 799 | 931
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 668 | 597
HELOC | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 843 | 949
Unpaid Principal Balance | 859 | 963
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 911 | 961
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 56 | 110
Unpaid Principal Balance | 56 | 401
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 75 | 88
Consumer | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 50
Unpaid Principal Balance | 0 | 119
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 17 | 23
Consumer | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 56 | 60
Unpaid Principal Balance | 56 | 282
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | $ 58 | $ 65

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