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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, 2017 | Sep. 30, 2016
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 282,439 | $ 285,243
Unpaid Principal Balance | 321,859 | 321,743
Related Allowance | 4,417 | 3,915
Average Recorded Investment | 265,297 | 265,771
Amount of related allowance included in specific reserves | 100 | 366
Amount of related allowance included in general reserves | 4,317 | 3,549
Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 48,538 | 23,712
Unpaid Principal Balance | 80,811 | 50,196
Related Allowance | 0 | 0
Average Recorded Investment | 33,613 | 15,479
Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 233,901 | 261,531
Unpaid Principal Balance | 241,048 | 271,547
Related Allowance | 4,417 | 3,915
Average Recorded Investment | 231,684 | 250,292
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 230,883 | 237,813
Unpaid Principal Balance | 237,672 | 243,961
Related Allowance | 4,316 | 3,809
Average Recorded Investment | 217,188 | 223,143
Single-family residential | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 25,928 | 9,627
Unpaid Principal Balance | 28,378 | 11,366
Related Allowance | 0 | 0
Average Recorded Investment | 14,350 | 6,511
Single-family residential | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 204,955 | 228,186
Unpaid Principal Balance | 209,294 | 232,595
Related Allowance | 4,316 | 3,809
Average Recorded Investment | 202,838 | 216,632
Construction, custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 296 |
Unpaid Principal Balance | 300 |
Related Allowance | 0 |
Average Recorded Investment | 99 |
Construction, custom | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 296 |
Unpaid Principal Balance | 300 |
Related Allowance | 0 |
Average Recorded Investment | 99 |
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 717 | 1,292
Unpaid Principal Balance | 8,940 | 11,095
Related Allowance | 3 | 1
Average Recorded Investment | 640 | 2,380
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 123 | 138
Unpaid Principal Balance | 8,346 | 9,001
Related Allowance | 0 | 0
Average Recorded Investment | 130 | 614
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 594 | 1,154
Unpaid Principal Balance | 594 | 2,094
Related Allowance | 3 | 1
Average Recorded Investment | 510 | 1,766
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,934 | 10,129
Unpaid Principal Balance | 10,902 | 11,287
Related Allowance | 0 | 1
Average Recorded Investment | 9,814 | 9,865
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 524 | 499
Unpaid Principal Balance | 587 | 609
Related Allowance | 0 | 0
Average Recorded Investment | 490 | 317
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,410 | 9,630
Unpaid Principal Balance | 10,315 | 10,678
Related Allowance | 0 | 1
Average Recorded Investment | 9,324 | 9,548
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,495 | 1,899
Unpaid Principal Balance | 6,035 | 5,477
Related Allowance | 10 | 13
Average Recorded Investment | 2,238 | 2,160
Multi-family | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,364 | 394
Unpaid Principal Balance | 4,904 | 3,972
Related Allowance | 0 | 0
Average Recorded Investment | 1,100 | 638
Multi-family | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,131 | 1,505
Unpaid Principal Balance | 1,131 | 1,505
Related Allowance | 10 | 13
Average Recorded Investment | 1,138 | 1,522
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 26,210 | 31,175
Unpaid Principal Balance | 36,908 | 44,149
Related Allowance | 88 | 91
Average Recorded Investment | 26,673 | 25,571
Commercial real estate | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,920 | 11,741
Unpaid Principal Balance | 18,978 | 21,301
Related Allowance | 0 | 0
Average Recorded Investment | 10,182 | 6,260
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 16,290 | 19,434
Unpaid Principal Balance | 17,930 | 22,848
Related Allowance | 88 | 91
Average Recorded Investment | 16,491 | 19,311
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,606 | 1,030
Unpaid Principal Balance | 16,096 | 3,082
Related Allowance | 0 | 0
Average Recorded Investment | 6,772 | 863
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,606 | 1,030
Unpaid Principal Balance | 16,096 | 3,082
Related Allowance | 0 | 0
Average Recorded Investment | 6,772 | 863
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,132 | 1,715
Unpaid Principal Balance | 3,343 | 1,836
Related Allowance | 0 | 0
Average Recorded Investment | 1,726 | 1,578
HELOC | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 718 | 209
Unpaid Principal Balance | 1,856 | 315
Related Allowance | 0 | 0
Average Recorded Investment | 443 | 165
HELOC | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,414 | 1,506
Unpaid Principal Balance | 1,487 | 1,521
Related Allowance | 0 | 0
Average Recorded Investment | 1,283 | 1,413
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 166 | 190
Unpaid Principal Balance | 1,663 | 856
Related Allowance | 0 | 0
Average Recorded Investment | 147 | 211
Consumer | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 59 | 74
Unpaid Principal Balance | 1,366 | 550
Related Allowance | 0 | 0
Average Recorded Investment | 47 | 111
Consumer | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 107 | 116
Unpaid Principal Balance | 297 | 306
Related Allowance | 0 | 0
Average Recorded Investment | $ 100 | $ 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=66008989&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=66008989&loc=SL6953423-111524 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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