Borrowings - Tabular Information (Details) - USD ($)	Sep. 30, 2020	Jun. 30, 2020
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	$ 4,000,000	$ 9,000,000
FHLB fixed rate advance (0.61%, matures 9/11/20)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	5,000,000
FHLB fixed rate advance (0.00%, matures 5/3/21)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	$ 4,000,000	$ 4,000,000

Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64702-112823

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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