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Fair Value Measurements - Fair value of Assets Measured on a Recurring Basis and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021
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Nonrecurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreclosed and repossessed assets held for sale | $ 144 | $ 280
Fair Value, Inputs, Level 3 | Nonrecurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreclosed and repossessed assets held for sale | 144 | 280
US States and Political Subdivisions Debt Securities | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 46,869 | 47,696
US States and Political Subdivisions Debt Securities | Fair Value, Inputs, Level 1 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0 | 0
US States and Political Subdivisions Debt Securities | Fair Value, Inputs, Level 2 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 46,869 | 47,696
US States and Political Subdivisions Debt Securities | Fair Value, Inputs, Level 3 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0 | 0
Corporate Obligations | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,832 | 20,311
Corporate Obligations | Fair Value, Inputs, Level 1 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0 | 0
Corporate Obligations | Fair Value, Inputs, Level 2 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,832 | 20,311
Corporate Obligations | Fair Value, Inputs, Level 3 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0 | 0
Other Debt Obligations | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 608 | 672
Other Debt Obligations | Fair Value, Inputs, Level 1 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0 | 0
Other Debt Obligations | Fair Value, Inputs, Level 2 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 608 | 672
Other Debt Obligations | Fair Value, Inputs, Level 3 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0 | 0
Total MBS and CMOs | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 143,100 | 138,341
Total MBS and CMOs | Fair Value, Inputs, Level 1 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0 | 0
Total MBS and CMOs | Fair Value, Inputs, Level 2 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 143,100 | 138,341
Total MBS and CMOs | Fair Value, Inputs, Level 3 | Recurring Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | $ 0 | $ 0

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