Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Document Period End Date	Dec. 31, 2019
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	$ 138,967	$ 109,807
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,637	2,032
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	36,185	304,628
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	584	12,178
Securities available-for-sale, Total, Estimated Fair Value	175,152	414,435
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,221	14,210
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	0	34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		294
Obligations of states and political subdivisions
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	230	11,837
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	272
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	1,439	22,068
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6	780
Securities available-for-sale, Total, Estimated Fair Value	1,669	33,905
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	6	1,052
U.S. Government agencies
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	123,289	84,975
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,247	1,593
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	34,746	282,560
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	578	11,398
Securities available-for-sale, Total, Estimated Fair Value	158,035	367,535
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,825	12,991
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		294
Trust preferred securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	4,200
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	347
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Securities available-for-sale, Total, Estimated Fair Value	4,200
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	347
Corporate securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	11,248	12,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	43	167
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Securities available-for-sale, Total, Estimated Fair Value	11,248	12,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 43	$ 167