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Derivatives (Equity Market Contracts Designated As Hedging Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Notional Amount Of Derivatives [Abstract]        
Derivative Asset Notional Amount   $ 465,700   $ 416,700
Derivative Liability, Notional Amount $ 206,347   $ 235,000  
Equity Swap [Member]        
Notional Amount Of Derivatives [Abstract]        
Derivative Asset Notional Amount 4,295   7,474  
Derivative Liability, Notional Amount 0   0  
Derivative Notional Amount $ 465,701   $ 416,739