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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, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 289,006 | $ 251,274
Unpaid Principal Balance | 301,003 | 289,340
Related Allowance | 3,596 | 4,156
Average Recorded Investment (Year-To-Date) | 261,419 | 274,530
Amount of related allowance included in specific reserves | 654 | 126
Amount of related allowance included in general reserves | 2,942 | 4,030
Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 98,487 | 43,897
Unpaid Principal Balance | 105,236 | 75,267
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 62,395 | 40,392
Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 190,519 | 207,377
Unpaid Principal Balance | 195,767 | 214,073
Related Allowance | 3,596 | 4,156
Average Recorded Investment (Year-To-Date) | 199,024 | 234,138
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 186,811 | 203,266
Unpaid Principal Balance | 191,634 | 210,047
Related Allowance | 2,942 | 4,030
Average Recorded Investment (Year-To-Date) | 193,720 | 224,094
Single-family residential | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 23,936 | 21,325
Unpaid Principal Balance | 25,229 | 23,880
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 21,889 | 19,371
Single-family residential | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 162,875 | 181,941
Unpaid Principal Balance | 166,405 | 186,167
Related Allowance | 2,942 | 4,030
Average Recorded Investment (Year-To-Date) | 171,831 | 204,723
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,898 |
Unpaid Principal Balance | 5,898 |
Related Allowance | 0 |
Average Recorded Investment (Year-To-Date) | 2,289 |
Construction | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,898 |
Unpaid Principal Balance | 5,898 |
Related Allowance | 0 |
Average Recorded Investment (Year-To-Date) | 2,289 |
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) | 49 | 231
Construction, custom | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 148
Unpaid Principal Balance | 0 | 165
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 49 | 231
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,186 | 420
Unpaid Principal Balance | 2,230 | 8,298
Related Allowance | 0 | 1
Average Recorded Investment (Year-To-Date) | 1,327 | 752
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,186 | 330
Unpaid Principal Balance | 2,230 | 8,208
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,297 | 176
Land - acquisition & development | Financing Receivable, Impairment, 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) | 30 | 576
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,223 | 8,157
Unpaid Principal Balance | 7,863 | 8,856
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 7,695 | 9,407
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 386 | 208
Unpaid Principal Balance | 432 | 330
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 298 | 431
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 6,837 | 7,949
Unpaid Principal Balance | 7,431 | 8,526
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 7,397 | 8,976
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,089 | 632
Unpaid Principal Balance | 3,089 | 3,724
Related Allowance | 4 | 5
Average Recorded Investment (Year-To-Date) | 1,484 | 1,772
Multi-family | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,616 | 139
Unpaid Principal Balance | 2,616 | 3,231
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,002 | 748
Multi-family | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 473 | 493
Unpaid Principal Balance | 473 | 493
Related Allowance | 4 | 5
Average Recorded Investment (Year-To-Date) | 482 | 1,024
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 45,090 | 27,969
Unpaid Principal Balance | 51,045 | 39,194
Related Allowance | 104 | 120
Average Recorded Investment (Year-To-Date) | 33,781 | 28,457
Commercial real estate | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 33,272 | 12,890
Unpaid Principal Balance | 38,372 | 22,487
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 20,845 | 11,466
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,818 | 15,079
Unpaid Principal Balance | 12,673 | 16,707
Related Allowance | 104 | 120
Average Recorded Investment (Year-To-Date) | 12,936 | 16,991
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 36,888 | 8,279
Unpaid Principal Balance | 36,995 | 14,321
Related Allowance | 546 | 0
Average Recorded Investment (Year-To-Date) | 18,954 | 7,722
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 29,882 | 8,279
Unpaid Principal Balance | 29,989 | 14,321
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 14,200 | 7,425
Commercial & industrial | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,006 | 0
Unpaid Principal Balance | 7,006 | 0
Related Allowance | 546 | 0
Average Recorded Investment (Year-To-Date) | 4,754 | 297
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,697 | 2,218
Unpaid Principal Balance | 1,872 | 3,018
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,964 | 1,938
HELOC | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 273 | 490
Unpaid Principal Balance | 366 | 1,212
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 461 | 487
HELOC | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,424 | 1,728
Unpaid Principal Balance | 1,506 | 1,806
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,503 | 1,451
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 124 | 185
Unpaid Principal Balance | 377 | 1,717
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 156 | 157
Consumer | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 38 | 88
Unpaid Principal Balance | 104 | 1,433
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 65 | 57
Consumer | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 86 | 97
Unpaid Principal Balance | 273 | 284
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | $ 91 | $ 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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