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Investment Securities (Narrative) (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Schedule Of Investments [Line Items]    
Securities pledged as collateral $ 850,400,000 $ 637,600,000
Number of security positions, unrealized loss position | Security 226 116
Number of security positions, unrealized loss position for more than 12 months | Security 127 28
Securities, 12 months or longer, Fair Value $ 760,210,000 $ 172,180,000
Securities, 12 months or longer, Unrealized Losses $ 155,102,000 $ 4,727,000
Number of security positions, unrealized loss position for less than 12 months | Security 99 88
Securities, Less than 12 months, Fair Value $ 193,800,000 $ 773,484,000
Securities, Less than 12 months, Unrealized Losses 17,922,000 10,039,000
Available for sale securities, allowance for credit loss 0 0
Debt securities, held-to-maturity 188,980,000 205,586,000
Investment securities, past due 3,998,718,000 3,631,355,000
Investment securities, nonaccrual 10,197,000 11,369,000
Municipal Bonds [Member]    
Schedule Of Investments [Line Items]    
Debt securities, held-to-maturity 90,600,000 105,600,000
Internally rated held-to-maturity securities 6,900,000 5,800,000
Total Past Due [Member]    
Schedule Of Investments [Line Items]    
Investment securities, past due 16,709,000 9,467,000
Available for Sale Securities [Member]    
Schedule Of Investments [Line Items]    
Accrued interest receivable 2,100,000 2,100,000
Held-to-Maturity Securities [Member]    
Schedule Of Investments [Line Items]    
Accrued interest receivable 695,000 696,000
Investment securities, nonaccrual 0  
Held-to-Maturity Securities [Member] | Maximum [Member]    
Schedule Of Investments [Line Items]    
Credit Loss Benefit Expense   $ 2,000
Held-to-Maturity Securities [Member] | Minimum [Member]    
Schedule Of Investments [Line Items]    
Credit Loss Benefit Expense 1,000  
Held-to-Maturity Securities [Member] | Total Past Due [Member]    
Schedule Of Investments [Line Items]    
Investment securities, past due $ 0