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Investment Securities (Narrative) (Details)
 3 Months Ended 6 Months Ended
Dec. 13, 2024
USD ($)
Jun. 30, 2025
USD ($)
Security
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Security
Schedule Of Investments [Line Items]            
Securities pledged as collateral   $ 860,800,000   $ 860,800,000   $ 828,800,000
Proceeds from Sale of Debt Securities, Available-for-Sale   $ 64,955,000 $ 0 $ 64,955,000 $ 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   50   50   76
Number of security positions, unrealized loss position for more than 12 months | Security   35   35   37
Securities, 12 months or longer, Fair Value   $ 168,959,000   $ 168,959,000   $ 176,627,000
Securities, 12 months or longer, Unrealized Losses   $ 47,321,000   $ 47,321,000   $ 53,433,000
Number of security positions, unrealized loss position for less than 12 months | Security   15   15   39
Securities, Less than 12 months, Fair Value   $ 236,362,000   $ 236,362,000   $ 681,223,000
Securities, Less than 12 months, Unrealized Losses   3,385,000   3,385,000   9,046,000
Available for sale securities, allowance for credit loss   0   0   0
Securities held to maturity, Amortized Cost   92,121,000   92,121,000   116,003,000
Internally rated held-to-maturity securities   $ 5,000,000   $ 5,000,000   $ 3,400,000
Investment, Type [Extensible Enumeration]   Municipal Bonds [Member]   Municipal Bonds [Member]   Municipal Bonds [Member]
Investment securities, past due   $ 4,536,002,000   $ 4,536,002,000   $ 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   19,796,000   19,796,000   22,030,000
Municipal Bonds [Member]            
Schedule Of Investments [Line Items]            
Securities held to maturity, Amortized Cost   31,100,000   31,100,000   41,900,000
Available for Sale Securities [Member]            
Schedule Of Investments [Line Items]            
Accrued interest receivable   3,300,000   3,300,000   3,400,000
Held To Maturity Investment Securities [Member]            
Schedule Of Investments [Line Items]            
Accrued interest receivable   396,000   396,000   456,000
Held To Maturity Investment Securities [Member] | Total Past Due [Member]            
Schedule Of Investments [Line Items]            
Investment securities, past due   0   0   $ 0
Held To Maturity Investment Securities [Member] | Maximum [Member]            
Schedule Of Investments [Line Items]            
Provision for credit loss   $ 1,000 $ 1,000 $ 1,000 $ 1,000