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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Security
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable   $ 39,100   $ 27,400
Net realized gains (loss) resulting from sale of available-for-sale securities   0 $ 0  
Transfers from available for sale securities to held to maturity $ 312,900      
Gain On Transfer Of securities $ 0      
Financial instruments pledged as collateral   $ 749,000   639,600
Number of available for sale securities whose amortized costs exceeded their fair values | Security   287    
Available-for-sale Securities, Continuous   $ 176,597    
Available-for-sale Securities, Continuous Unrealized   23,824    
Available-for-sale Securities, Continuous   $ 1,760,568    
Percentage of available-for-sale portfolio   93.70%    
Pledged [Member]        
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Trading securities pledged   $ 1,200,000   1,200,000
Other Assets [Member]        
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]        
Accrued interest receivable   $ 39,500   $ 29,100