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Securities - Schedule of Available for Sale Securities Pledged (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Jun. 30, 2022
Schedule of Available-for-sale Securities [Line Items]    
Investment securities available for sale $ 1,227,729 $ 1,344,093
Asset Pledged as Collateral    
Schedule of Available-for-sale Securities [Line Items]    
Investment securities available for sale 730,455 913,960
Asset Pledged as Collateral | Pledged for borrowings at the FHLB of New York    
Schedule of Available-for-sale Securities [Line Items]    
Investment securities available for sale 0 178,048
Asset Pledged as Collateral | Pledged to secure public funds on deposit    
Schedule of Available-for-sale Securities [Line Items]    
Investment securities available for sale 201,239 357,841
Asset Pledged as Collateral | Pledged for potential borrowings at the Federal Reserve Bank of New York    
Schedule of Available-for-sale Securities [Line Items]    
Investment securities available for sale $ 529,216 $ 378,071