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Investment Securities (Narrative) (Details)
 3 Months Ended
Dec. 13, 2024
USD ($)
Mar. 31, 2025
USD ($)
Security
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Security
Schedule Of Investments [Line Items]        
Securities pledged as collateral   $ 971,400,000   $ 828,800,000
Proceeds from Sale of Debt Securities, Available-for-Sale   $ 0 $ 0  
Proceeds from sales used to fund losses $ 653,500,000      
Pre-tax loss 100,200,000      
Number of security positions, unrealized loss position | Security   46   76
Number of security positions, unrealized loss position for more than 12 months | Security   37   37
Securities, 12 months or longer, Fair Value   $ 178,397,000   $ 176,627,000
Securities, 12 months or longer, Unrealized Losses   $ 48,907,000   $ 53,433,000
Number of security positions, unrealized loss position for less than 12 months | Security   9   39
Securities, Less than 12 months, Fair Value   $ 136,319,000   $ 681,223,000
Securities, Less than 12 months, Unrealized Losses   1,955,000   9,046,000
Available for sale securities, allowance for credit loss   0   0
Securities held to maturity, Amortized Cost   113,107,000   116,003,000
Internally rated held-to-maturity securities   $ 4,800,000   $ 3,400,000
Investment, Type [Extensible Enumeration]   Municipal Bonds [Member]   Municipal Bonds [Member]
Investment securities, past due   $ 4,553,278,000   $ 4,479,204,000
Higher-Yielding Agency Wrapped Investments [Member]        
Schedule Of Investments [Line Items]        
Net proceeds from sale of securities to purchase investment $ 642,600,000      
Total Past Due [Member]        
Schedule Of Investments [Line Items]        
Investment securities, past due   12,725,000   22,030,000
Municipal Bonds [Member]        
Schedule Of Investments [Line Items]        
Securities held to maturity, Amortized Cost   39,800,000   41,900,000
Available for Sale Securities [Member]        
Schedule Of Investments [Line Items]        
Accrued interest receivable   3,300,000   3,300,000
Held To Maturity Investment Securities [Member]        
Schedule Of Investments [Line Items]        
Accrued interest receivable   645,000   456,000
Held To Maturity Investment Securities [Member] | Total Past Due [Member]        
Schedule Of Investments [Line Items]        
Investment securities, past due   0   $ 0
Held To Maturity Investment Securities [Member] | Maximum [Member]        
Schedule Of Investments [Line Items]        
Provision for credit loss   $ 1,000 $ 1,000