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Fair Value of Financial Instruments - Corporations assets measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value $ 1,061 $ 1,312
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - available for sale 2,090 2,155
Loans held for investment, at fair value 1,061 1,312
Interest-only strips 9 9
Total assets 3,160 3,476
Liabilities 0  
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 1,340 1,370
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 652 683
Recurring | Private issue CMO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - available for sale 98 102
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
Liabilities 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 1,992 2,053
Loans held for investment, at fair value 0 0
Interest-only strips 0 0
Total assets 1,992 2,053
Liabilities 0 0
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 1,340 1,370
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 652 683
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 98 102
Loans held for investment, at fair value 1,061 1,312
Interest-only strips 9 9
Total assets 1,168 1,423
Liabilities 0 0
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 $ 98 $ 102