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Investment Securities - Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Short-Term Debt [Line Items]      
Total balance of loans $ 1,061   $ 1,312
Impairment losses on investment securities 0 $ 0  
Pledged as Collateral | Pledged to FRB      
Short-Term Debt [Line Items]      
Total balance of loans 106,600   0
Federal Home Loan Bank Advances      
Short-Term Debt [Line Items]      
Federal Home Loan Bank advances, unused borrowing facility 286,900   287,900
Pledged to FRB | Discount Window Facility      
Short-Term Debt [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 185,300   139,000
Securities held as collateral 143,600   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