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Fair Value of Financial Assets and Liabilities - Fair Value of Senior Notes and Residual Trust Certificates (Details) - Senior Notes and Residual Trust Certificates - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value at beginning of period $ 51,678 $ 16,170
Additions 0 54,998
Cash received (due to payments or sales) (33,544) (19,559)
Change in unrealized gain (loss) 6 (509)
Accrued interest 1,205 595
Reversal of (impairment on) securities available for sale (432) (17)
Fair value at end of period $ 18,913 $ 51,678