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Investment Securities - Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Jun. 30, 2023
Short-Term Debt [Line Items]            
Total available borrowing capacity across all sources         $ 491,900 $ 476,900
Total balance of loans         1,054 1,312
Impairment losses on investment securities $ 0 $ 0 $ 0 $ 0    
Pledged as Collateral | Pledged to FRB            
Short-Term Debt [Line Items]            
Total balance of loans         104,500 0
Federal Home Loan Bank Advances            
Short-Term Debt [Line Items]            
Federal Home Loan Bank advances, unused borrowing facility         269,200 287,900
Pledged to FRB | Discount Window Facility            
Short-Term Debt [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity         172,700 139,000
Securities held as collateral         132,300 150,300
Advances outstanding         0 0
Federal Funds Purchased            
Short-Term Debt [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity         $ 50,000 $ 50,000