Fair Value of Financial Instruments - Corporation's assets measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	$ 4,173	$ 5,094
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	5,237	5,969
Loans held for investment, at fair value	4,173	5,094
Interest-only strips	13	16
Total assets	9,423	11,079
Total liabilities	0
Recurring \| U.S. government agency MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	3,246	3,613
Recurring \| U.S. government sponsored enterprise MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	1,760	2,087
Recurring \| Private issue CMO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	231	269
Recurring \| Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	0	0
Loans held for investment, at fair value	0	0
Interest-only strips	0	0
Total assets	0	0
Total liabilities	0	0
Recurring \| Fair Value, Inputs, Level 1 \| U.S. government agency MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	0	0
Recurring \| Fair Value, Inputs, Level 1 \| U.S. government sponsored enterprise MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	0	0
Recurring \| Fair Value, Inputs, Level 1 \| Private issue CMO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	0	0
Recurring \| Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	5,006	5,700
Loans held for investment, at fair value	0	0
Interest-only strips	0	0
Total assets	5,006	5,700
Total liabilities	0	0
Recurring \| Fair Value, Inputs, Level 2 \| U.S. government agency MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	3,246	3,613
Recurring \| Fair Value, Inputs, Level 2 \| U.S. government sponsored enterprise MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	1,760	2,087
Recurring \| Fair Value, Inputs, Level 2 \| Private issue CMO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	0	0
Recurring \| Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	231	269
Loans held for investment, at fair value	4,173	5,094
Interest-only strips	13	16
Total assets	4,417	5,379
Total liabilities	0	0
Recurring \| Fair Value, Inputs, Level 3 \| U.S. government agency MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	0	0
Recurring \| Fair Value, Inputs, Level 3 \| U.S. government sponsored enterprise MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	0	0
Recurring \| Fair Value, Inputs, Level 3 \| Private issue CMO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - available for sale	$ 231	$ 269

Loans Held for Investment, at Fair Value

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- Definition

Loans Receivable, Interest Income, Fair Value Disclosure

+ References

No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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- Definition

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+ References

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- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

+ References

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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