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Investment Securities (Narrative) (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
Security
Schedule Of Investments [Line Items]    
Securities pledged as collateral $ 845,200,000 $ 850,400,000
Number of security positions, unrealized loss position | Security 201 226
Number of security positions, unrealized loss position for more than 12 months | Security 198 127
Securities, 12 months or longer, Fair Value $ 835,522,000 $ 760,210,000
Securities, 12 months or longer, Unrealized Losses $ 151,546,000 $ 155,102,000
Number of security positions, unrealized loss position for less than 12 months | Security 3 99
Securities, Less than 12 months, Fair Value $ 8,000 $ 193,800,000
Securities, Less than 12 months, Unrealized Losses 0 17,922,000
Available for sale securities, allowance for credit loss 0  
Securities held to maturity, Amortized Cost $ 148,160,000 $ 188,980,000
Investment, Type [Extensible Enumeration] Municipal Bonds [Member] Municipal Bonds [Member]
Investment securities, past due $ 4,416,251,000 $ 3,998,718,000
Impairment on securities 0  
Municipal Bonds [Member]    
Schedule Of Investments [Line Items]    
Securities held to maturity, Amortized Cost 64,600,000 90,600,000
Internally rated held-to-maturity securities 4,200,000 6,900,000
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 29,347,000 16,709,000
Available for Sale Securities [Member]    
Schedule Of Investments [Line Items]    
Accrued interest receivable 2,100,000 2,100,000
Held To Maturity Investment Securities [Member]    
Schedule Of Investments [Line Items]    
Accrued interest receivable 571,000 695,000
Credit Loss Benefit Expense 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