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Disclosures About Fair Value of Assets - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($) | Sep. 30, 2023 | Jun. 30, 2023
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Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | $ 191,112,000 | $ 201,299,000
Mortgage servicing rights | 1,540,000 | 1,482,000
U.S. Treasury [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 430,000 | 438,000
U.S. Government and federal agency and Government sponsored enterprises (GSE's) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 6,427,000 | 6,477,000
Mortgage-backed: GSE residential [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 166,578,000 | 175,726,000
Small Business Administration [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 14,268,000 | 15,233,000
State and political subdivisions [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 3,409,000 | 3,425,000
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 430,000 | 438,000
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and federal agency and Government sponsored enterprises (GSE's) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 6,427,000 | 6,477,000
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed: GSE residential [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 166,578 | 175,726,000
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 14,268,000 | 15,233,000
Significant Other Observable Inputs (Level 2) [Member] | State and political subdivisions [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 1,048,000 | 1,064,000
Significant Unobservable Inputs (Level 3) [Member] |  |
Available-for-sale securities: |  |
Mortgage servicing rights | 1,540,000 | 1,482,000
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | $ 2,361,000 | $ 2,361,000

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-2 + Details
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