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Federal Home Loan Bank Advances and Other Borrowings (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 01, 2022
Aug. 31, 2022
Dec. 31, 2021
Loan and Security Agreement | Revolving Line of Credit          
Federal Home Loan Bank Advances and Other Borrowings          
Bank stock (as a percent)         100.00%
Borrowing capacity     $ 40.0 $ 25.0  
Outstanding balance under the revolving line of credit $ 13.8 $ 13.8      
Federal Home Loan Bank Advances          
Federal Home Loan Bank Advances and Other Borrowings          
Principal balances 1,370.0 1,200.0      
Remaining available borrowings $ 516.5 $ 390.9