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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, 2015 | Sep. 30, 2014
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 363,216 | $ 435,185
Unpaid Principal Balance | 393,993 | 470,190
Related Allowance | 8,057 | 10,587
Average Recorded Investment | 363,891 | 403,138
Amount of related allowance included in specific reserves |  | 60
Amount of related allowance included in general reserves |  | 10,527
Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 41,982 | 46,680
Unpaid Principal Balance | 64,774 | 73,123
Related Allowance | 0 | 0
Average Recorded Investment | 41,085 | 37,474
Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 321,234 | 388,505
Unpaid Principal Balance | 329,219 | 397,067
Related Allowance | 8,057 | 10,587
Average Recorded Investment | 322,806 | 365,664
Single-Family Residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 296,703 | 346,364
Unpaid Principal Balance | 303,194 | 354,497
Related Allowance | 8,057 | 10,527
Average Recorded Investment | 296,613 | 333,191
Single-Family Residential [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 21,524 | 24,044
Unpaid Principal Balance | 24,151 | 26,628
Related Allowance | 0 | 0
Average Recorded Investment | 20,724 | 16,843
Single-Family Residential [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 275,179 | 322,320
Unpaid Principal Balance | 279,043 | 327,869
Related Allowance | 8,057 | 10,527
Average Recorded Investment | 275,889 | 316,348
Construction - Speculative [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 6,984 | 9,159
Unpaid Principal Balance | 7,969 | 10,159
Related Allowance | 0 | 60
Average Recorded Investment | 7,004 | 9,336
Construction - Speculative [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 613 | 1,603
Unpaid Principal Balance | 808 | 2,173
Related Allowance | 0 | 0
Average Recorded Investment | 615 | 1,804
Construction - Speculative [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 6,371 | 7,556
Unpaid Principal Balance | 7,161 | 7,986
Related Allowance | 0 | 60
Average Recorded Investment | 6,389 | 7,532
Construction - Custom [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 355 |
Unpaid Principal Balance | 355 |
Related Allowance | 0 |
Average Recorded Investment | 178 |
Construction - Custom [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 355 |
Unpaid Principal Balance | 355 |
Related Allowance | 0 |
Average Recorded Investment | 178 |
Construction - Custom [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 |
Unpaid Principal Balance | 0 |
Related Allowance | 0 |
Average Recorded Investment | 0 |
Land - Acquisition & Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,216 | 5,533
Unpaid Principal Balance | 5,699 | 7,961
Related Allowance | 0 | 0
Average Recorded Investment | 4,254 | 5,152
Land - Acquisition & Development [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 680 | 837
Unpaid Principal Balance | 1,223 | 2,325
Related Allowance | 0 | 0
Average Recorded Investment | 683 | 1,038
Land - Acquisition & Development [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,536 | 4,696
Unpaid Principal Balance | 4,476 | 5,636
Related Allowance | 0 | 0
Average Recorded Investment | 3,571 | 4,114
Land - Consumer Lot Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 12,641 | 13,976
Unpaid Principal Balance | 12,992 | 14,457
Related Allowance | 0 | 0
Average Recorded Investment | 12,596 | 13,571
Land - Consumer Lot Loans [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,101 | 974
Unpaid Principal Balance | 1,187 | 1,072
Related Allowance | 0 | 0
Average Recorded Investment | 969 | 713
Land - Consumer Lot Loans [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,540 | 13,002
Unpaid Principal Balance | 11,805 | 13,385
Related Allowance | 0 | 0
Average Recorded Investment | 11,627 | 12,858
Multi-Family [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,374 | 6,354
Unpaid Principal Balance | 5,374 | 6,574
Related Allowance | 0 | 0
Average Recorded Investment | 4,991 | 5,284
Multi-Family [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,531 | 1,111
Unpaid Principal Balance | 1,531 | 1,111
Related Allowance | 0 | 0
Average Recorded Investment | 1,138 | 327
Multi-Family [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,843 | 5,243
Unpaid Principal Balance | 3,843 | 5,463
Related Allowance | 0 | 0
Average Recorded Investment | 3,853 | 4,957
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 29,667 | 47,393
Unpaid Principal Balance | 36,003 | 55,113
Related Allowance | 0 | 0
Average Recorded Investment | 29,757 | 30,292
Commercial Real Estate [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 10,416 | 13,234
Unpaid Principal Balance | 14,797 | 20,085
Related Allowance | 0 | 0
Average Recorded Investment | 9,795 | 11,720
Commercial Real Estate [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 19,251 | 34,159
Unpaid Principal Balance | 21,206 | 35,028
Related Allowance | 0 | 0
Average Recorded Investment | 19,962 | 18,572
Commercial & Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,340 | 3,195
Unpaid Principal Balance | 18,276 | 17,166
Related Allowance | 0 | 0
Average Recorded Investment | 5,664 | 3,900
Commercial & Industrial [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,340 | 3,195
Unpaid Principal Balance | 18,276 | 17,166
Related Allowance | 0 | 0
Average Recorded Investment | 5,664 | 3,900
Commercial & Industrial [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 |
Unpaid Principal Balance | 0 |
Related Allowance | 0 |
Average Recorded Investment | 0 |
HELOC [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,402 | 2,505
Unpaid Principal Balance | 3,213 | 3,216
Related Allowance | 0 | 0
Average Recorded Investment | 2,299 | 1,816
HELOC [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,008 | 1,019
Unpaid Principal Balance | 1,819 | 1,730
Related Allowance | 0 | 0
Average Recorded Investment | 905 | 612
HELOC [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,394 | 1,486
Unpaid Principal Balance | 1,394 | 1,486
Related Allowance | 0 | 0
Average Recorded Investment | 1,394 | 1,204
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 534 | 706
Unpaid Principal Balance | 918 | 1,047
Related Allowance | 0 | 0
Average Recorded Investment | 535 | 596
Consumer [Member] | Financing Receivable, Impairment, No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 414 | 663
Unpaid Principal Balance | 627 | 833
Related Allowance | 0 | 0
Average Recorded Investment | 414 | 517
Consumer [Member] | Financing Receivable, Impairment, Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 120 | 43
Unpaid Principal Balance | 291 | 214
Related Allowance | 0 | 0
Average Recorded Investment | $ 121 | $ 79

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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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