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Subordinated Debt And Other Borrowing Arrangements (Narrative) (Details) - USD ($)
 9 Months Ended
Dec. 20, 2019
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Short-term borrowings outstanding     $ 185,000,000
Federal Reserve Bank [Member]      
Debt Instrument [Line Items]      
Borrowing capacity   $ 839,400,000 786,500,000
Short-term borrowings outstanding   0 $ 0
Federal Home Loan Bank [Member]      
Debt Instrument [Line Items]      
Interest rate at end of period     4.78%
Short-term borrowings outstanding   0 $ 70,000,000.0
Remaining borrowing capacity   500,200,000 391,200,000
Federal Funds Line Of Credit [Member]      
Debt Instrument [Line Items]      
Borrowing capacity   200,000,000.0 175,000,000.0
Line of credit, outstanding   $ 0 $ 115,000,000.0
Federal Funds Line Of Credit [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Interest rate paid on borrowings     4.65%
Federal Funds Line Of Credit [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Interest rate paid on borrowings     4.40%
Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Debt, face amount $ 22,000,000.0    
Debt instrument term   10 years  
Debt, maturity date   Dec. 30, 2029  
Debt, stated interest rate 5.00%    
Debt, basis spread 3.595%    
Interest rate at end of period   7.57%  
Debt, redeemable period, subject to conditions   5 years  
Subordinated Debt [Member] | Fixed-To-Floating Rate Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Debt, interest rate term   5 years