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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract | 11 | 14
Pre-modification outstanding recorded investment | $ 9,268 | $ 2,566
Post-modification outstanding recorded investment | $ 9,268 | $ 2,566
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract | 8 | 12
Pre-modification outstanding recorded investment | $ 2,012 | $ 2,134
Post-modification outstanding recorded investment | $ 2,012 | $ 2,134
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract | 0 | 1
Pre-modification outstanding recorded investment | $ 0 | $ 204
Post-modification outstanding recorded investment | $ 0 | $ 204
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract | 3 | 0
Pre-modification outstanding recorded investment | $ 7,256 | $ 0
Post-modification outstanding recorded investment | $ 7,256 | $ 0
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract | 0 | 1
Pre-modification outstanding recorded investment | $ 0 | $ 228
Post-modification outstanding recorded investment | $ 0 | $ 228

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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