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Investment Securities - Investments with Unrealized Loss Positions for total investment securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Schedule of Available-for-sale Securities [Line Items]    
Unrealized Holding Losses Less Than 12 Months, Fair Value $ 2,299 $ 12,272
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 4 276
Unrealized Holding Losses 12 Months or More, Fair Value 125,354 125,386
Unrealized Holding Losses 12 Months or More, Unrealized Losses 20,772 18,582
Unrealized Holding Losses Total, Fair Value 127,653 137,658
Unrealized Holding Losses Total, Unrealized Losses 20,776 $ 18,858
Allowance for credit losses on investment securities 0  
U.S. Government sponsored enterprise securities    
Schedule of Available-for-sale Securities [Line Items]    
Allowance for credit losses on investment securities $ 0