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Investment Securities (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Security
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Security
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Security
Schedule Of Investments [Line Items]          
Securities pledged as collateral $ 795,000,000   $ 795,000,000   $ 850,400,000
Number of security positions, unrealized loss position | Security 221   221   226
Number of security positions, unrealized loss position for more than 12 months | Security 196   196   127
Securities, 12 months or longer, Fair Value $ 903,146,000   $ 903,146,000   $ 760,210,000
Securities, 12 months or longer, Unrealized Losses $ 169,723,000   $ 169,723,000   $ 155,102,000
Number of security positions, unrealized loss position for less than 12 months | Security 25   25   99,000,000
Securities, Less than 12 months, Fair Value $ 8,644,000   $ 8,644,000   $ 193,800,000
Securities, Less than 12 months, Unrealized Losses 661,000   661,000   17,922,000
Available for sale securities, allowance for credit loss 0   0   0
Securities held to maturity, Amortized Cost 159,897,000   159,897,000   188,980,000
Investment securities, past due 4,348,224,000   4,348,224,000   3,998,718,000
Investment securities, nonaccrual 9,902,000   9,902,000   10,197,000
Total Past Due [Member]          
Schedule Of Investments [Line Items]          
Investment securities, past due 18,964,000   18,964,000   16,709,000
Municipal Bonds [Member]          
Schedule Of Investments [Line Items]          
Securities held to maturity, Amortized Cost 71,200,000   71,200,000   90,600,000
Internally rated held-to-maturity securities 4,600,000   4,600,000   6,900,000
Held To Maturity Securities Non Rated 300,000   300,000    
Maximum [Member]          
Schedule Of Investments [Line Items]          
Securities, 12 months or longer, Unrealized Losses 169,700,000   169,700,000   155,100,000
Available for Sale Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 2,000,000   2,000,000   2,100,000
Held To Maturity Investment Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 643,000   643,000   695,000
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