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Accumulated Other Comprehensive Income (Loss) (Summary Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (57,353)  
Other comprehensive income (loss) 7,390 $ (23,469)
Ending balance (49,963)  
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) 7,390 (23,469)
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized gains and losses on available-for-sale securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (57,353) (256)
Other comprehensive loss before reclassification 7,392 (23,469)
Amount reclassified from accumulated other comprehensive (income) loss (2)  
Other comprehensive income (loss) 7,390 (23,469)
Ending balance $ (49,963) $ (23,725)