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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value $ 310,692 $ 1,177,420
Securities Available-for-Sale, Less than 12 months, Unrealized losses 11,384 63,796
Securities Available-for-Sale, 12 months or longer, Fair value 1,130,414 413,070
Securities Available-for-Sale, 12 months or longer, Unrealized losses 98,067 58,980
Securities Available-for-Sale, Fair value, Total 1,441,106 1,590,490
Securities Available-for-Sale, Unrealized losses, Total 109,451 122,776
US Government Corporations and Agencies Securities    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value 13,411 37,213
Securities Available-for-Sale, Less than 12 months, Unrealized losses 590 1,787
Securities Available-for-Sale, 12 months or longer, Fair value 23,933  
Securities Available-for-Sale, 12 months or longer, Unrealized losses 1,066  
Securities Available-for-Sale, Fair value, Total 37,344 37,213
Securities Available-for-Sale, Unrealized losses, Total 1,656 1,787
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value 52,910 270,905
Securities Available-for-Sale, Less than 12 months, Unrealized losses 1,102 18,194
Securities Available-for-Sale, 12 months or longer, Fair value 85,762  
Securities Available-for-Sale, 12 months or longer, Unrealized losses 13,231  
Securities Available-for-Sale, Fair value, Total 138,672 270,905
Securities Available-for-Sale, Unrealized losses, Total 14,333 18,194
U.S. Government Sponsored Entities Asset-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value 197,348 446,423
Securities Available-for-Sale, Less than 12 months, Unrealized losses 7,644 27,507
Securities Available-for-Sale, 12 months or longer, Fair value 532,913 310,338
Securities Available-for-Sale, 12 months or longer, Unrealized losses 67,561 55,131
Securities Available-for-Sale, Fair value, Total 730,261 756,761
Securities Available-for-Sale, Unrealized losses, Total 75,205 82,638
Collateralized Loan Obligations    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value 35,179 415,491
Securities Available-for-Sale, Less than 12 months, Unrealized losses 492 15,446
Securities Available-for-Sale, 12 months or longer, Fair value 484,249 101,048
Securities Available-for-Sale, 12 months or longer, Unrealized losses 15,516 3,533
Securities Available-for-Sale, Fair value, Total 519,428 516,539
Securities Available-for-Sale, Unrealized losses, Total 16,008 18,979
Corporate Debt Securities    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value 11,844 7,388
Securities Available-for-Sale, Less than 12 months, Unrealized losses 1,556 862
Securities Available-for-Sale, 12 months or longer, Fair value 3,557 1,684
Securities Available-for-Sale, 12 months or longer, Unrealized losses 693 316
Securities Available-for-Sale, Fair value, Total 15,401 9,072
Securities Available-for-Sale, Unrealized losses, Total $ 2,249 $ 1,178