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Allowance for Losses on Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | $ 127,155 | $ 118,456 | $ 123,073 | $ 113,494
Charge-offs | (439) | (1,093) | (1,191) | (1,497)
Recoveries | 1,810 | 6,309 | 5,644 | 12,009
Provision & Transfers | (950) | (1,750) | 50 | (2,084)
Ending Allowance | 127,576 | 121,922 | 127,576 | 121,922
Single-family residential |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 35,928 | 38,206 | 36,892 | 37,796
Charge-offs | (290) | (381) | (750) | (496)
Recoveries | 211 | 223 | 331 | 374
Provision & Transfers | (1,705) | (884) | (2,329) | (510)
Ending Allowance | 34,144 | 37,164 | 34,144 | 37,164
Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 25,214 | 21,934 | 24,556 | 19,838
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision & Transfers | 2,175 | 3,127 | 2,833 | 5,223
Ending Allowance | 27,389 | 25,061 | 27,389 | 25,061
Construction - custom |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 2,052 | 1,110 | 1,944 | 1,080
Charge-offs | 0 | (3) | (50) | (3)
Recoveries | 0 | 0 | 0 | 0
Provision & Transfers | 29 | 69 | 187 | 99
Ending Allowance | 2,081 | 1,176 | 2,081 | 1,176
Land - acquisition & development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 7,355 | 6,665 | 6,829 | 6,023
Charge-offs | 0 | (43) | 0 | (63)
Recoveries | 1,207 | 4,211 | 4,579 | 8,229
Provision & Transfers | (940) | (4,164) | (3,786) | (7,520)
Ending Allowance | 7,622 | 6,669 | 7,622 | 6,669
Land - consumer lot loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 2,906 | 2,501 | 2,649 | 2,535
Charge-offs | (18) | 0 | (66) | (17)
Recoveries | 0 | 180 | 0 | 250
Provision & Transfers | (35) | (168) | 270 | (255)
Ending Allowance | 2,853 | 2,513 | 2,853 | 2,513
Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 7,904 | 7,629 | 7,862 | 6,925
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision & Transfers | 78 | 300 | 120 | 1,004
Ending Allowance | 7,982 | 7,929 | 7,982 | 7,929
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 11,625 | 10,168 | 11,818 | 8,588
Charge-offs | (36) | 0 | (36) | (11)
Recoveries | 1 | 1,164 | 1 | 1,520
Provision & Transfers | (2) | (560) | (195) | 675
Ending Allowance | 11,588 | 10,772 | 11,588 | 10,772
Commercial & industrial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 29,268 | 27,736 | 28,524 | 28,008
Charge-offs | 0 | (105) | (116) | (163)
Recoveries | 115 | 217 | 170 | 942
Provision & Transfers | (53) | 517 | 752 | (422)
Ending Allowance | 29,330 | 28,365 | 29,330 | 28,365
HELOC |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 808 | 832 | 855 | 813
Charge-offs | (1) | (53) | (1) | (90)
Recoveries | 0 | 0 | 1 | 1
Provision & Transfers | (5) | 47 | (53) | 102
Ending Allowance | 802 | 826 | 802 | 826
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning Allowance | 4,095 | 1,675 | 1,144 | 1,888
Charge-offs | (94) | (508) | (172) | (654)
Recoveries | 276 | 314 | 562 | 693
Provision & Transfers | (492) | (34) | 2,251 | (480)
Ending Allowance | $ 3,785 | $ 1,447 | $ 3,785 | $ 1,447

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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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