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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, 2016 | Sep. 30, 2015
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 276,538 | $ 341,579
Unpaid Principal Balance | 308,894 | 381,223
Related Allowance | 4,406 | 6,678
Average Recorded Investment | 275,273 | 333,815
Amount of related allowance included in specific reserves | 897 | 275
Amount of related allowance included in general reserves | 3,509 | 6,403
Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 18,402 | 38,866
Unpaid Principal Balance | 40,363 | 70,564
Related Allowance | 0 | 0
Average Recorded Investment | 16,891 | 29,474
Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 258,136 | 302,713
Unpaid Principal Balance | 268,531 | 310,659
Related Allowance | 4,406 | 6,678
Average Recorded Investment | 258,382 | 304,341
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 233,135 | 276,711
Unpaid Principal Balance | 238,920 | 282,912
Related Allowance | 4,202 | 6,678
Average Recorded Investment | 232,765 | 274,097
Single-family residential | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,602 | 17,250
Unpaid Principal Balance | 11,287 | 19,644
Related Allowance | 0 | 0
Average Recorded Investment | 8,491 | 14,069
Single-family residential | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 223,533 | 259,461
Unpaid Principal Balance | 227,633 | 263,268
Related Allowance | 4,202 | 6,678
Average Recorded Investment | 224,274 | 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 | 578 | 554
Unpaid Principal Balance | 578 | 554
Related Allowance | 0 | 0
Average Recorded Investment | 289 | 182
Construction - custom | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 578 | 554
Unpaid Principal Balance | 578 | 554
Related Allowance | 0 | 0
Average Recorded Investment | 289 | 182
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,618 | 5,056
Unpaid Principal Balance | 11,049 | 12,852
Related Allowance | 8 | 0
Average Recorded Investment | 1,707 | 4,404
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 164 | 2,570
Unpaid Principal Balance | 8,393 | 9,426
Related Allowance | 0 | 0
Average Recorded Investment | 164 | 926
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,454 | 2,486
Unpaid Principal Balance | 2,656 | 3,426
Related Allowance | 8 | 0
Average Recorded Investment | 1,543 | 3,478
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 10,322 | 12,016
Unpaid Principal Balance | 11,481 | 12,368
Related Allowance | 5 | 0
Average Recorded Investment | 10,347 | 11,868
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 650 | 727
Unpaid Principal Balance | 747 | 814
Related Allowance | 0 | 0
Average Recorded Investment | 599 | 544
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,672 | 11,289
Unpaid Principal Balance | 10,734 | 11,554
Related Allowance | 5 | 0
Average Recorded Investment | 9,748 | 11,324
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,941 | 7,593
Unpaid Principal Balance | 5,690 | 10,877
Related Allowance | 11 | 0
Average Recorded Investment | 2,254 | 5,277
Multi-family | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 428 | 3,770
Unpaid Principal Balance | 4,177 | 7,054
Related Allowance | 0 | 0
Average Recorded Investment | 736 | 1,545
Multi-family | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,513 | 3,823
Unpaid Principal Balance | 1,513 | 3,823
Related Allowance | 11 | 0
Average Recorded Investment | 1,518 | 3,732
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 26,163 | 28,551
Unpaid Principal Balance | 30,904 | 36,698
Related Allowance | 180 | 0
Average Recorded Investment | 25,513 | 27,016
Commercial real estate | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,673 | 9,427
Unpaid Principal Balance | 6,588 | 15,620
Related Allowance | 0 | 0
Average Recorded Investment | 5,697 | 8,130
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 20,490 | 19,124
Unpaid Principal Balance | 24,316 | 21,078
Related Allowance | 180 | 0
Average Recorded Investment | 19,816 | 18,886
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 906 | 2,955
Unpaid Principal Balance | 7,627 | 13,066
Related Allowance | 0 | 0
Average Recorded Investment | 544 | 2,681
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 906 | 2,955
Unpaid Principal Balance | 7,627 | 13,066
Related Allowance | 0 | 0
Average Recorded Investment | 544 | 2,681
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,747 | 2,126
Unpaid Principal Balance | 1,877 | 2,975
Related Allowance | 0 | 0
Average Recorded Investment | 1,742 | 1,895
HELOC | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 368 | 683
Unpaid Principal Balance | 483 | 1,532
Related Allowance | 0 | 0
Average Recorded Investment | 354 | 536
HELOC | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,379 | 1,443
Unpaid Principal Balance | 1,394 | 1,443
Related Allowance | 0 | 0
Average Recorded Investment | 1,388 | 1,359
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 128 | 576
Unpaid Principal Balance | 768 | 992
Related Allowance | 0 | 0
Average Recorded Investment | 112 | 492
Consumer | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 33 | 477
Unpaid Principal Balance | 483 | 703
Related Allowance | 0 | 0
Average Recorded Investment | 17 | 390
Consumer | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 95 | 99
Unpaid Principal Balance | 285 | 289
Related Allowance | 0 | 0
Average Recorded Investment | $ 95 | $ 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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