Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 653,779	$ 73,478
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7,084	245
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	29,918	4,135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	437	457
Debt Securities, Available-for-sale, Unrealized Loss Position	683,697	77,613
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	7,521	702
Obligations of states and political subdivisions
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	13,277	10,578
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	152	139
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,420	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	63	0
Debt Securities, Available-for-sale, Unrealized Loss Position	15,697	10,578
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	215	139
U.S. Government agencies
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	639,514	62,412
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,920	105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	23,295	35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	7	0
Debt Securities, Available-for-sale, Unrealized Loss Position	662,809	62,447
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	6,927	105
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, Held-to-maturity, 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	4,203	4,100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	367	457
Debt Securities, Available-for-sale, Unrealized Loss Position	4,203	4,100
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	367	457
Corporate securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	988	488
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	988	488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 12	$ 1