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Allowance for Losses on Loans - Allowance for Losses on Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | $ 113,494 | $ 106,829
Charge-offs | (2,700) | (6,000)
Recoveries | 17,007 | 19,065
Provision & Transfers | (4,728) | (6,400)
Ending Allowance | 123,073 | 113,494
Single-family residential |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 37,796 | 47,347
Charge-offs | (1,229) | (3,106)
Recoveries | 653 | 3,251
Provision & Transfers | (328) | (9,696)
Ending Allowance | 36,892 | 37,796
Construction |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 19,838 | 6,680
Charge-offs | 0 | 0
Recoveries | 0 | 745
Provision & Transfers | 4,718 | 12,413
Ending Allowance | 24,556 | 19,838
Construction - custom |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 1,080 | 990
Charge-offs | (16) | (60)
Recoveries | 0 | 60
Provision & Transfers | 880 | 90
Ending Allowance | 1,944 | 1,080
Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 6,023 | 5,781
Charge-offs | (280) | (42)
Recoveries | 11,038 | 8,220
Provision & Transfers | (9,952) | (7,936)
Ending Allowance | 6,829 | 6,023
Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 2,535 | 2,946
Charge-offs | (17) | (732)
Recoveries | 481 | 5
Provision & Transfers | (350) | 316
Ending Allowance | 2,649 | 2,535
Multi-family |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 6,925 | 5,304
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | 937 | 1,621
Ending Allowance | 7,862 | 6,925
Commercial real estate |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 8,588 | 8,960
Charge-offs | (11) | (103)
Recoveries | 1,684 | 1,812
Provision & Transfers | 1,557 | (2,081)
Ending Allowance | 11,818 | 8,588
Commercial & industrial |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 28,008 | 24,980
Charge-offs | (173) | (941)
Recoveries | 1,833 | 2,933
Provision & Transfers | (1,144) | 1,036
Ending Allowance | 28,524 | 28,008
HELOC |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 813 | 902
Charge-offs | (90) | (54)
Recoveries | 21 | 21
Provision & Transfers | 111 | (56)
Ending Allowance | 855 | 813
Consumer |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 1,888 | 2,939
Charge-offs | (884) | (962)
Recoveries | 1,297 | 2,018
Provision & Transfers | (1,157) | (2,107)
Ending Allowance | $ 1,144 | $ 1,888

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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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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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