Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 766,882	$ 535,672
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	75,309	4,966
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	394,860	29,918
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	93,680	437
Debt Securities, Available-for-sale, Unrealized Loss Position	1,161,742	565,590
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	168,989	5,403
Obligations of states and political subdivisions
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	203,173	13,277
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	21,929	152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	13,359	2,420
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,395	63
Debt Securities, Available-for-sale, Unrealized Loss Position	216,532	15,697
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	24,324	215
U.S. Government agencies
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	533,611	521,407
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	50,268	4,802
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	376,778	23,295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	90,418	7
Debt Securities, Available-for-sale, Unrealized Loss Position	910,389	544,702
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	140,686	4,809
Private label
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	7,126
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	464
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	7,126
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	464
Trust preferred securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,828	4,203
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	762	367
Debt Securities, Available-for-sale, Unrealized Loss Position	3,828	4,203
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	762	367
Corporate securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	22,972	988
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,648	12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	895	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	105	0
Debt Securities, Available-for-sale, Unrealized Loss Position	23,867	988
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,753	$ 12