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Loans (Loan Modifications Made To Borrowers Experiencing Financial Difficulty) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]        
AMORTIZED COST BASIS $ 0.0 $ 0.2 $ 0.3 $ 3.1
% OF TOTAL SEGMENT 0.00% 0.00% 0.00% 0.05%
Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
AMORTIZED COST BASIS   $ 0.0   $ 0.0
% OF TOTAL SEGMENT   0.00%   0.00%
Commercial | Combination of principal and/or interest deferral and extension of term        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
AMORTIZED COST BASIS   $ 0.0   $ 0.0
% OF TOTAL SEGMENT   0.00%   0.00%
Loans, modified in period, no amortized cost   $ 32.5    
Loans, modified and repaid in period   $ 32.5    
Commercial | Deferred Principal and Interest        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing receivable, modified, weighted average term increase from modification   6 months   6 months
Financing receivable, modified, deferred principal and interest   $ 32.5   $ 32.5
Commercial | Extension of Term        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing receivable, modified, weighted average term increase from modification   6 months   6 months
Personal        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
AMORTIZED COST BASIS $ 0.0 $ 0.2 $ 0.3 $ 3.1
% OF TOTAL SEGMENT 0.00% 0.00% 0.00% 0.05%
Personal | Residential Real Estate | Deferred Principal and Interest        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
AMORTIZED COST BASIS   $ 0.2   $ 3.1
% OF TOTAL SEGMENT   0.00%   0.05%
Financing receivable, modified, weighted average term increase from modification       9 months
Personal | Residential Real Estate | Extension of Term        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
AMORTIZED COST BASIS $ 0.0   $ 0.1  
% OF TOTAL SEGMENT 0.00%   0.00%  
Financing receivable, modified, weighted average term increase from modification     14 months  
Personal | Private Client | Extension of Term        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
AMORTIZED COST BASIS $ 0.0 $ 0.0 $ 0.2 $ 0.0
% OF TOTAL SEGMENT 0.00% 0.00% 0.00% 0.00%
Financing receivable, modified, weighted average term increase from modification   60 months 22 months 60 months
Loans, modified in period, no amortized cost   $ 0.2