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Summary of Significant Accounting Policies - Allowance of Credit Losses (ACL) on Loans and Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Summary of Significant Accounting Policies    
Financing receivable accrued interest after allowance for credit loss $ 4.7 $ 4.6
Reserve for off-balance sheet credit exposure 0.0  
ACL $ 0.0