Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 75,682	$ 56,215
Securities Available-for-Sale, Less than 12 months, Unrealized losses	341	1,122
Securities Available-for-Sale, 12 months or longer, Fair value	1,003,286	1,150,640
Securities Available-for-Sale, 12 months or longer, Unrealized losses	86,571	86,033
Securities Available-for-Sale, Fair value, Total	1,078,968	1,206,855
Securities Available-for-Sale, Unrealized losses, Total	86,912	87,155
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	37,808	46,685
Securities Available-for-Sale, Less than 12 months, Unrealized losses	276	420
Securities Available-for-Sale, 12 months or longer, Fair value	131,395	103,993
Securities Available-for-Sale, 12 months or longer, Unrealized losses	13,476	11,100
Securities Available-for-Sale, Fair value, Total	169,203	150,678
Securities Available-for-Sale, Unrealized losses, Total	13,752	11,520
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, 12 months or longer, Fair value	601,810	634,261
Securities Available-for-Sale, 12 months or longer, Unrealized losses	69,466	68,193
Securities Available-for-Sale, Fair value, Total	601,810	634,261
Securities Available-for-Sale, Unrealized losses, Total	69,466	68,193
Collateralized Loan Obligations
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	34,873
Securities Available-for-Sale, Less than 12 months, Unrealized losses	25
Securities Available-for-Sale, 12 months or longer, Fair value	254,721	404,019
Securities Available-for-Sale, 12 months or longer, Unrealized losses	1,339	4,857
Securities Available-for-Sale, Fair value, Total	289,594	404,019
Securities Available-for-Sale, Unrealized losses, Total	1,364	4,857
Corporate Debt Securities
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	3,001	9,530
Securities Available-for-Sale, Less than 12 months, Unrealized losses	40	702
Securities Available-for-Sale, 12 months or longer, Fair value	15,360	8,367
Securities Available-for-Sale, 12 months or longer, Unrealized losses	2,290	1,883
Securities Available-for-Sale, Fair value, Total	18,361	17,897
Securities Available-for-Sale, Unrealized losses, Total	$ 2,330	$ 2,585