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Loans and Allowance for Credit Losses on Loans - Major Classifications - Loan Concentrations (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Loans    
Loans and leases receivable, accrued interest receivable $ 19.4 $ 20.5
Real estate | Loan receivables | Customer Concentration Risk    
Loans    
Loans receivable as a percentage of total portfolio 67.80% 68.80%