Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,782,922	$ 1,854,852
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,718	1,620
Securities Available-for-Sale, Gross Unrealized Holding Losses	115,776	122,776
Debt Securities, Available-for-sale	1,668,864	1,733,696
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	421,479	423,285
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,718	1,620
Securities Available-for-Sale, Gross Unrealized Holding Losses	15,733	18,194
Debt Securities, Available-for-sale	407,464	406,711
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	769,715	839,399
Securities Available-for-Sale, Gross Unrealized Holding Losses	82,337	82,638
Debt Securities, Available-for-sale	687,378	756,761
Corporate Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	18,562	17,650
Securities Available-for-Sale, Gross Unrealized Holding Losses	3,054	1,178
Debt Securities, Available-for-sale	15,508	16,472
Collateralized Loan Obligations
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	534,166	535,518
Securities Available-for-Sale, Gross Unrealized Holding Losses	12,765	18,979
Debt Securities, Available-for-sale	521,401	516,539
US Government Corporations and Agencies Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	39,000	39,000
Securities Available-for-Sale, Gross Unrealized Holding Losses	1,887	1,787
Debt Securities, Available-for-sale	$ 37,113	$ 37,213