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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

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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

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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

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