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CREDIT DISCLSOURES - Troubled Debt Restructured Loans (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) loan | Mar. 31, 2017 USD ($) loan | Mar. 31, 2018 USD ($) loan | Mar. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |  |
Loans modified in TDR | $ | $ 2.6 | $ 0.0 | $ 3.8 | $ 0.0
Loans modified in TDR, subsequent default | 0 | 0 | 0 | 0
Agricultural Operating [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | 3 |  | 5 |
Consumer [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | 1 |  | 1 |
1-4 Family Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Loans modified in TDR | $ | $ 0.1 |  |  |
Number of contracts |  |  | 1 |

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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=66008989&loc=SL6953676-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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