Securities Sold Under Agreements to Repurchase- Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned	$ 0.0	$ 4.4
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned		$ 5.8

Carrying value of securities sold under agreements to repurchase and deposits received for securities loaned.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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