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Allowance for Losses on Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | $ 123,073 | $ 113,494
Charge-offs | (752) | (404)
Recoveries | 3,834 | 5,700
Provision & Transfers | 1,000 | (334)
Ending Allowance | 127,155 | 118,456
Single-family residential |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 36,892 | 37,796
Charge-offs | (461) | (115)
Recoveries | 121 | 151
Provision & Transfers | (624) | 374
Ending Allowance | 35,928 | 38,206
Construction |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 24,556 | 19,838
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | 658 | 2,096
Ending Allowance | 25,214 | 21,934
Construction - custom |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 1,944 | 1,080
Charge-offs | (50) | 0
Recoveries | 0 | 0
Provision & Transfers | 158 | 30
Ending Allowance | 2,052 | 1,110
Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 6,829 | 6,023
Charge-offs | 0 | (20)
Recoveries | 3,372 | 4,018
Provision & Transfers | (2,846) | (3,356)
Ending Allowance | 7,355 | 6,665
Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 2,649 | 2,535
Charge-offs | (47) | (17)
Recoveries | 0 | 70
Provision & Transfers | 304 | (87)
Ending Allowance | 2,906 | 2,501
Multi-family |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 7,862 | 6,925
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | 42 | 704
Ending Allowance | 7,904 | 7,629
Commercial real estate |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 11,818 | 8,588
Charge-offs | 0 | (11)
Recoveries | 0 | 356
Provision & Transfers | (193) | 1,235
Ending Allowance | 11,625 | 10,168
Commercial & industrial |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 28,524 | 28,008
Charge-offs | (116) | (58)
Recoveries | 55 | 725
Provision & Transfers | 805 | (939)
Ending Allowance | 29,268 | 27,736
HELOC |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 855 | 813
Charge-offs | 0 | (37)
Recoveries | 0 | 1
Provision & Transfers | (47) | 55
Ending Allowance | 808 | 832
Consumer |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 1,144 | 1,888
Charge-offs | (78) | (146)
Recoveries | 286 | 379
Provision & Transfers | 2,743 | (446)
Ending Allowance | $ 4,095 | $ 1,675

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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