Fair Value of Financial Instruments - Carrying amount and fair value of the Corporation's other financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - held to maturity	$ 118,627	$ 94,090
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - held to maturity	0	0
Loans held for investment, not recorded at fair value	0	0
FHLB - San Francisco stock	0	0
Deposits	0	0
Borrowings	0	0
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - held to maturity	121,201	95,359
Loans held for investment, not recorded at fair value	0	0
FHLB - San Francisco stock	7,970	8,199
Deposits	0	0
Borrowings	0	0
Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - held to maturity	0	0
Loans held for investment, not recorded at fair value	902,074	861,374
FHLB - San Francisco stock	0	0
Deposits	864,239	813,087
Borrowings	149,976	102,826
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - held to maturity	118,627	94,090
Loans held for investment, not recorded at fair value	900,538	874,831
FHLB - San Francisco stock	7,970	8,199
Deposits	892,969	841,271
Borrowings	141,047	101,107
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - held to maturity	121,201	95,359
Loans held for investment, not recorded at fair value	902,074	861,374
FHLB - San Francisco stock	7,970	8,199
Deposits	864,239	813,087
Borrowings	$ 149,976	$ 102,826

Loans Held for Investment, Net, Fair Value Disclosure

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

+ Details

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

+ References

No definition available.

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