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Investment Securities (Narrative) (Details)
 12 Months Ended
Dec. 13, 2024
USD ($)
Dec. 31, 2024
USD ($)
Security
Dec. 31, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
Schedule Of Investments [Line Items]        
Securities pledged as collateral   $ 828,800,000 $ 845,200,000  
Proceeds from sales used to fund losses $ 653,500,000      
Pre-tax loss 100,200,000      
Number of security positions, unrealized loss position | Security   76 201  
Number of security positions, unrealized loss position for more than 12 months | Security   39 198  
Securities, 12 months or longer, Fair Value   $ 176,627,000 $ 835,522,000  
Securities, 12 months or longer, Unrealized Losses   $ 53,433,000 $ 151,546,000  
Number of security positions, unrealized loss position for less than 12 months | Security   37 3  
Securities, Less than 12 months, Fair Value   $ 681,223,000 $ 8,000  
Securities, Less than 12 months, Unrealized Losses   9,046,000 0  
Available for sale securities, allowance for credit loss   0    
Securities held to maturity, Amortized Cost   116,003,000 148,160,000  
Internally rated held-to-maturity securities   $ 3,400,000 $ 4,200,000  
Investment, Type [Extensible Enumeration]   Municipal Bonds [Member] Municipal Bonds [Member]  
Investment securities, past due   $ 4,479,204,000 $ 4,462,139,000  
Higher-Yielding Agency Wrapped Investments [Member]        
Schedule Of Investments [Line Items]        
Net proceeds from sale of securities to purchase investment $ 642,600,000      
Municipal Bonds [Member]        
Schedule Of Investments [Line Items]        
Securities held to maturity, Amortized Cost   41,900,000 64,600,000  
Maximum [Member]        
Schedule Of Investments [Line Items]        
Securities, Less than 12 months, Unrealized Losses     1,000  
Total Past Due [Member]        
Schedule Of Investments [Line Items]        
Investment securities, past due   22,030,000 29,347,000  
Available for Sale Securities [Member]        
Schedule Of Investments [Line Items]        
Accrued interest receivable   3,400,000 2,100,000  
Held To Maturity Investment Securities [Member]        
Schedule Of Investments [Line Items]        
Accrued interest receivable   456,000 571,000  
Credit Loss Benefit Expense   2,000 $ 1,000  
Held To Maturity Investment Securities [Member] | Maximum [Member]        
Schedule Of Investments [Line Items]        
Credit Loss Benefit Expense       $ 1,000
Held To Maturity Investment Securities [Member] | Total Past Due [Member]        
Schedule Of Investments [Line Items]        
Investment securities, past due   $ 0