Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,747,396	$ 1,854,852
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	17	1,620
Securities Available-for-Sale, Gross Unrealized Holding Losses	138,257	122,776
Debt Securities, Available-for-sale	1,609,156	1,733,696
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	420,590	423,285
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	17	1,620
Securities Available-for-Sale, Gross Unrealized Holding Losses	31,510	18,194
Debt Securities, Available-for-sale	389,097	406,711
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	735,317	839,399
Securities Available-for-Sale, Gross Unrealized Holding Losses	95,035	82,638
Debt Securities, Available-for-sale	640,282	756,761
Corporate Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	20,459	17,650
Securities Available-for-Sale, Gross Unrealized Holding Losses	2,873	1,178
Debt Securities, Available-for-sale	17,586	16,472
Collateralized Loan Obligations
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	532,030	535,518
Securities Available-for-Sale, Gross Unrealized Holding Losses	7,139	18,979
Debt Securities, Available-for-sale	524,891	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	1,700	1,787
Debt Securities, Available-for-sale	$ 37,300	$ 37,213