Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 288,445	$ 1,177,420
Securities Available-for-Sale, Less than 12 months, Unrealized losses	9,558	63,796
Securities Available-for-Sale, 12 months or longer, Fair value	1,303,558	413,070
Securities Available-for-Sale, 12 months or longer, Unrealized losses	128,699	58,980
Securities Available-for-Sale, Fair value, Total	1,592,003	1,590,490
Securities Available-for-Sale, Unrealized losses, Total	138,257	122,776
US Government Corporations and Agencies Securities
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value		37,213
Securities Available-for-Sale, Less than 12 months, Unrealized losses		1,787
Securities Available-for-Sale, 12 months or longer, Fair value	37,300
Securities Available-for-Sale, 12 months or longer, Unrealized losses	1,700
Securities Available-for-Sale, Fair value, Total	37,300	37,213
Securities Available-for-Sale, Unrealized losses, Total	1,700	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	277,975	270,905
Securities Available-for-Sale, Less than 12 months, Unrealized losses	8,626	18,194
Securities Available-for-Sale, 12 months or longer, Fair value	93,969
Securities Available-for-Sale, 12 months or longer, Unrealized losses	22,884
Securities Available-for-Sale, Fair value, Total	371,944	270,905
Securities Available-for-Sale, Unrealized losses, Total	31,510	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	1,171	446,423
Securities Available-for-Sale, Less than 12 months, Unrealized losses	22	27,507
Securities Available-for-Sale, 12 months or longer, Fair value	639,111	310,338
Securities Available-for-Sale, 12 months or longer, Unrealized losses	95,013	55,131
Securities Available-for-Sale, Fair value, Total	640,282	756,761
Securities Available-for-Sale, Unrealized losses, Total	95,035	82,638
Collateralized Loan Obligations
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value		415,491
Securities Available-for-Sale, Less than 12 months, Unrealized losses		15,446
Securities Available-for-Sale, 12 months or longer, Fair value	524,891	101,048
Securities Available-for-Sale, 12 months or longer, Unrealized losses	7,139	3,533
Securities Available-for-Sale, Fair value, Total	524,891	516,539
Securities Available-for-Sale, Unrealized losses, Total	7,139	18,979
Corporate Debt Securities
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	9,299	7,388
Securities Available-for-Sale, Less than 12 months, Unrealized losses	910	862
Securities Available-for-Sale, 12 months or longer, Fair value	8,287	1,684
Securities Available-for-Sale, 12 months or longer, Unrealized losses	1,963	316
Securities Available-for-Sale, Fair value, Total	17,586	9,072
Securities Available-for-Sale, Unrealized losses, Total	$ 2,873	$ 1,178