Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 205,011	$ 1,177,420
Securities Available-for-Sale, Less than 12 months, Unrealized losses	5,664	63,796
Securities Available-for-Sale, 12 months or longer, Fair value	1,279,229	413,070
Securities Available-for-Sale, 12 months or longer, Unrealized losses	110,112	58,980
Securities Available-for-Sale, Fair value, Total	1,484,240	1,590,490
Securities Available-for-Sale, Unrealized losses, Total	115,776	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	37,113
Securities Available-for-Sale, 12 months or longer, Unrealized losses	1,887
Securities Available-for-Sale, Fair value, Total	37,113	37,213
Securities Available-for-Sale, Unrealized losses, Total	1,887	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	124,659	270,905
Securities Available-for-Sale, Less than 12 months, Unrealized losses	1,017	18,194
Securities Available-for-Sale, 12 months or longer, Fair value	98,181
Securities Available-for-Sale, 12 months or longer, Unrealized losses	14,716
Securities Available-for-Sale, Fair value, Total	222,840	270,905
Securities Available-for-Sale, Unrealized losses, Total	15,733	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	72,961	446,423
Securities Available-for-Sale, Less than 12 months, Unrealized losses	3,726	27,507
Securities Available-for-Sale, 12 months or longer, Fair value	614,417	310,338
Securities Available-for-Sale, 12 months or longer, Unrealized losses	78,611	55,131
Securities Available-for-Sale, Fair value, Total	687,378	756,761
Securities Available-for-Sale, Unrealized losses, Total	82,337	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	521,401	101,048
Securities Available-for-Sale, 12 months or longer, Unrealized losses	12,765	3,533
Securities Available-for-Sale, Fair value, Total	521,401	516,539
Securities Available-for-Sale, Unrealized losses, Total	12,765	18,979
Corporate Debt Securities
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	7,391	7,388
Securities Available-for-Sale, Less than 12 months, Unrealized losses	921	862
Securities Available-for-Sale, 12 months or longer, Fair value	8,117	1,684
Securities Available-for-Sale, 12 months or longer, Unrealized losses	2,133	316
Securities Available-for-Sale, Fair value, Total	15,508	9,072
Securities Available-for-Sale, Unrealized losses, Total	$ 3,054	$ 1,178