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Federal Home Loan Bank Advances and Other Borrowings (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 01, 2022
USD ($)
Aug. 31, 2022
USD ($)
Dec. 31, 2021
Federal Home Loan Bank Advances and Other Borrowings          
Federal Funds Purchased   $ 287,000,000      
Loan and Security Agreement | Revolving Line of Credit          
Federal Home Loan Bank Advances and Other Borrowings          
Bank stock (as a percent)         100.00%
Total Debt Outstanding $ 13,750,000 13,750      
Interest rate (as a percent) 8.50%        
Borrowing capacity     $ 40,000,000.0 $ 25,000,000.0  
Variable spread on debt (as a percent) 3.85%        
Federal Home Loan Bank Advances          
Federal Home Loan Bank Advances and Other Borrowings          
Principal balances $ 1,450,000,000 1,200,000,000      
Remaining available borrowings 498,700,000 390,900,000      
Federal Reserve Discount Window          
Federal Home Loan Bank Advances and Other Borrowings          
Principal balances 1,080,000,000.00 225,300,000      
Investment securities collateral pledged with fair value 170,700,000        
Outstanding borrowings 0 0      
Remaining available borrowings $ 979,400,000 157,800,000      
Federal Funds Purchased          
Federal Home Loan Bank Advances and Other Borrowings          
Number of business days 1        
Federal Funds Purchased $ 0 $ 287,000,000.0