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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, 2016 | Sep. 30, 2015
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 291,139 | $ 341,579
Unpaid Principal Balance | 322,378 | 381,223
Related Allowance | 4,459 | 6,678
Average Recorded Investment | 290,774 | 333,815
Amount of related allowance included in specific reserves | 1,036 | 275
Amount of related allowance included in general reserves | 3,423 | 6,403
Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 20,831 | 38,866
Unpaid Principal Balance | 43,054 | 70,564
Related Allowance | 0 | 0
Average Recorded Investment | 18,258 | 29,474
Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 270,308 | 302,713
Unpaid Principal Balance | 279,324 | 310,659
Related Allowance | 4,459 | 6,678
Average Recorded Investment | 272,516 | 304,341
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 245,362 | 276,711
Unpaid Principal Balance | 251,075 | 282,912
Related Allowance | 4,277 | 6,678
Average Recorded Investment | 244,605 | 274,097
Single-family residential | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,818 | 17,250
Unpaid Principal Balance | 13,412 | 19,644
Related Allowance | 0 | 0
Average Recorded Investment | 10,345 | 14,069
Single-family residential | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 233,544 | 259,461
Unpaid Principal Balance | 237,663 | 263,268
Related Allowance | 4,277 | 6,678
Average Recorded Investment | 234,260 | 260,028
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 5,441
Unpaid Principal Balance |  | 7,929
Related Allowance |  | 0
Average Recorded Investment |  | 5,903
Construction | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 453
Unpaid Principal Balance |  | 2,151
Related Allowance |  | 0
Average Recorded Investment |  | 471
Construction | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 4,988
Unpaid Principal Balance |  | 5,778
Related Allowance |  | 0
Average Recorded Investment |  | 5,432
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 699 | 554
Unpaid Principal Balance | 759 | 554
Related Allowance | 0 | 0
Average Recorded Investment | 449 | 182
Construction - custom | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 699 | 554
Unpaid Principal Balance | 759 | 554
Related Allowance | 0 | 0
Average Recorded Investment | 449 | 182
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,820 | 5,056
Unpaid Principal Balance | 11,920 | 12,852
Related Allowance | 24 | 0
Average Recorded Investment | 2,232 | 4,404
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 188 | 2,570
Unpaid Principal Balance | 9,086 | 9,426
Related Allowance | 0 | 0
Average Recorded Investment | 365 | 926
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,632 | 2,486
Unpaid Principal Balance | 2,834 | 3,426
Related Allowance | 24 | 0
Average Recorded Investment | 1,867 | 3,478
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 10,529 | 12,016
Unpaid Principal Balance | 11,671 | 12,368
Related Allowance | 7 | 0
Average Recorded Investment | 10,914 | 11,868
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 548 | 727
Unpaid Principal Balance | 634 | 814
Related Allowance | 0 | 0
Average Recorded Investment | 418 | 544
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,981 | 11,289
Unpaid Principal Balance | 11,037 | 11,554
Related Allowance | 7 | 0
Average Recorded Investment | 10,496 | 11,324
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,566 | 7,593
Unpaid Principal Balance | 6,315 | 10,877
Related Allowance | 11 | 0
Average Recorded Investment | 2,202 | 5,277
Multi-family | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,044 | 3,770
Unpaid Principal Balance | 4,793 | 7,054
Related Allowance | 0 | 0
Average Recorded Investment | 675 | 1,545
Multi-family | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,522 | 3,823
Unpaid Principal Balance | 1,522 | 3,823
Related Allowance | 11 | 0
Average Recorded Investment | 1,527 | 3,732
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 27,936 | 28,551
Unpaid Principal Balance | 31,014 | 36,698
Related Allowance | 140 | 0
Average Recorded Investment | 27,767 | 27,016
Commercial real estate | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,797 | 9,427
Unpaid Principal Balance | 6,428 | 15,620
Related Allowance | 0 | 0
Average Recorded Investment | 4,891 | 8,130
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 22,139 | 19,124
Unpaid Principal Balance | 24,586 | 21,078
Related Allowance | 140 | 0
Average Recorded Investment | 22,876 | 18,886
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 182 | 2,955
Unpaid Principal Balance | 6,611 | 13,066
Related Allowance | 0 | 0
Average Recorded Investment | 567 | 2,681
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 182 | 2,955
Unpaid Principal Balance | 6,611 | 13,066
Related Allowance | 0 | 0
Average Recorded Investment | 567 | 2,681
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,835 | 2,126
Unpaid Principal Balance | 2,228 | 2,975
Related Allowance | 0 | 0
Average Recorded Investment | 1,724 | 1,895
HELOC | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 439 | 683
Unpaid Principal Balance | 830 | 1,532
Related Allowance | 0 | 0
Average Recorded Investment | 330 | 536
HELOC | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,396 | 1,443
Unpaid Principal Balance | 1,398 | 1,443
Related Allowance | 0 | 0
Average Recorded Investment | 1,394 | 1,359
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 210 | 576
Unpaid Principal Balance | 785 | 992
Related Allowance | 0 | 0
Average Recorded Investment | 314 | 492
Consumer | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 116 | 477
Unpaid Principal Balance | 501 | 703
Related Allowance | 0 | 0
Average Recorded Investment | 218 | 390
Consumer | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 94 | 99
Unpaid Principal Balance | 284 | 289
Related Allowance | 0 | 0
Average Recorded Investment | $ 96 | $ 102

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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=49124121&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=49124121&loc=SL6953423-111524 + Details
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