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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
Jun. 30, 2023
Short-Term Debt [Line Items]          
Total available borrowing capacity across all sources $ 499,500   $ 499,500   $ 476,900
Total balance of loans 1,092   1,092   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 107,000   107,000   0
Federal Home Loan Bank Advances          
Short-Term Debt [Line Items]          
Federal Home Loan Bank advances, unused borrowing facility 266,500   266,500   287,900
Pledged to FRB | Discount Window Facility          
Short-Term Debt [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 183,000   183,000   139,000
Securities held as collateral 137,800   137,800   150,300
Advances outstanding 0   0   0
Federal Funds Purchased          
Short-Term Debt [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 50,000   $ 50,000   $ 50,000