DERIVATIVES - Offsetting (Details) - Not designated as hedging instruments - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Interest rate swap
DERIVATIVES
Derivative notional amount	$ 697.8	$ 515.4
Interest rate swap - Commercial borrowers
DERIVATIVES
Derivative notional amount	348.9	257.7
Interest rate swap - Third party counterparties
DERIVATIVES
Derivative notional amount	$ 348.9	$ 257.7

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant