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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, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 267,527 | $ 251,274
Unpaid Principal Balance | 281,484 | 289,340
Related Allowance | 2,874 | 4,156
Average Recorded Investment (Year-To-Date) | 262,946 | 274,530
Amount of related allowance included in specific reserves | 82 | 126
Amount of related allowance included in general reserves | 2,792 | 4,030
Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 95,924 | 43,897
Unpaid Principal Balance | 102,290 | 75,267
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 70,777 | 40,392
Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 171,603 | 207,377
Unpaid Principal Balance | 179,194 | 214,073
Related Allowance | 2,874 | 4,156
Average Recorded Investment (Year-To-Date) | 192,169 | 234,138
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 175,470 | 203,266
Unpaid Principal Balance | 179,954 | 210,047
Related Allowance | 2,792 | 4,030
Average Recorded Investment (Year-To-Date) | 189,155 | 224,094
Single-family residential | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 22,114 | 21,325
Unpaid Principal Balance | 23,310 | 23,880
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 21,944 | 19,371
Single-family residential | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 153,356 | 181,941
Unpaid Principal Balance | 156,644 | 186,167
Related Allowance | 2,792 | 4,030
Average Recorded Investment (Year-To-Date) | 167,211 | 204,723
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,843 |
Unpaid Principal Balance | 4,933 |
Related Allowance | 0 |
Average Recorded Investment (Year-To-Date) | 2,928 |
Construction | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,843 |
Unpaid Principal Balance | 4,933 |
Related Allowance | 0 |
Average Recorded Investment (Year-To-Date) | 2,928 |
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 148
Unpaid Principal Balance | 0 | 165
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 37 | 231
Construction - custom | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 148
Unpaid Principal Balance | 0 | 165
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 37 | 231
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,073 | 420
Unpaid Principal Balance | 3,120 | 8,298
Related Allowance | 0 | 1
Average Recorded Investment (Year-To-Date) | 1,764 | 752
Land - acquisition & development | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,073 | 330
Unpaid Principal Balance | 3,120 | 8,208
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,741 | 176
Land - acquisition & development | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 90
Unpaid Principal Balance | 0 | 90
Related Allowance | 0 | 1
Average Recorded Investment (Year-To-Date) | 23 | 576
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,591 | 8,157
Unpaid Principal Balance | 5,992 | 8,856
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 7,169 | 9,407
Land - consumer lot loans | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 455 | 208
Unpaid Principal Balance | 490 | 330
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 337 | 431
Land - consumer lot loans | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,136 | 7,949
Unpaid Principal Balance | 5,502 | 8,526
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 6,832 | 8,976
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,067 | 632
Unpaid Principal Balance | 3,067 | 3,724
Related Allowance | 5 | 5
Average Recorded Investment (Year-To-Date) | 1,880 | 1,772
Multi-family | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,606 | 139
Unpaid Principal Balance | 2,606 | 3,231
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,403 | 748
Multi-family | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 461 | 493
Unpaid Principal Balance | 461 | 493
Related Allowance | 5 | 5
Average Recorded Investment (Year-To-Date) | 477 | 1,024
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 33,980 | 27,969
Unpaid Principal Balance | 39,347 | 39,194
Related Allowance | 77 | 120
Average Recorded Investment (Year-To-Date) | 33,830 | 28,457
Commercial real estate | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 26,818 | 12,890
Unpaid Principal Balance | 31,372 | 22,487
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 22,338 | 11,466
Commercial real estate | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,162 | 15,079
Unpaid Principal Balance | 7,975 | 16,707
Related Allowance | 77 | 120
Average Recorded Investment (Year-To-Date) | 11,492 | 16,991
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 39,351 | 8,279
Unpaid Principal Balance | 42,700 | 14,321
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 24,054 | 7,722
Commercial & industrial | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 35,427 | 8,279
Unpaid Principal Balance | 35,736 | 14,321
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 19,507 | 7,425
Commercial & industrial | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,924 | 0
Unpaid Principal Balance | 6,964 | 0
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 4,547 | 297
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,053 | 2,218
Unpaid Principal Balance | 2,230 | 3,018
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,986 | 1,938
HELOC | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 562 | 490
Unpaid Principal Balance | 655 | 1,212
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 486 | 487
HELOC | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,491 | 1,728
Unpaid Principal Balance | 1,575 | 1,806
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,500 | 1,451
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 99 | 185
Unpaid Principal Balance | 141 | 1,717
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 143 | 157
Consumer | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 26 | 88
Unpaid Principal Balance | 68 | 1,433
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 56 | 57
Consumer | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 73 | 97
Unpaid Principal Balance | 73 | 284
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | $ 87 | $ 100

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