Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	$ 323,918	$ 73,478
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	4,454	245
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	20,439	4,135
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	400	457
Securities available-for-sale, Total, Estimated Fair Value	344,357	77,613
Securities available-for-sale, Total, Unrealized Loss	4,854	702
Obligations of states and political subdivisions
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	97,157	10,578
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	1,086	139
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	2,386	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	98	0
Securities available-for-sale, Total, Estimated Fair Value	99,543	10,578
Securities available-for-sale, Total, Unrealized Loss	1,184	139
U.S. Government Agencies Mortgage-backed Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	225,763	62,412
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	3,366	105
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	13,290	35
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	16	0
Securities available-for-sale, Total, Estimated Fair Value	239,053	62,447
Securities available-for-sale, Total, Unrealized Loss	3,382	105
Trust preferred securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	0	0
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	0	0
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	4,275	4,100
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	285	457
Securities available-for-sale, Total, Estimated Fair Value	4,275	4,100
Securities available-for-sale, Total, Unrealized Loss	285	457
Corporate securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	998	488
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	2	1
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	488	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	1	0
Securities available-for-sale, Total, Estimated Fair Value	1,486	488
Securities available-for-sale, Total, Unrealized Loss	$ 3	$ 1