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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	$ 12,978	$ 111,307
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	625	2,099
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	364,004	304,628
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	7,226	12,178
Securities available-for-sale, Total, Estimated Fair Value	376,982	415,935
Securities available-for-sale, Total, Unrealized Loss	7,851	14,277
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	5,896	5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	99	168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	5,896	34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	99	294
Obligations Of States And Political Subdivisions
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	832	11,837
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	3	272
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	20,922	22,068
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	282	780
Securities available-for-sale, Total, Estimated Fair Value	21,754	33,905
Securities available-for-sale, Total, Unrealized Loss	285	1,052
U.S. Government Agencies Mortgage-backed Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	5,654	84,975
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	2	1,593
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	343,082	282,560
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	6,944	11,398
Securities available-for-sale, Total, Estimated Fair Value	348,736	367,535
Securities available-for-sale, Total, Unrealized Loss	6,946	12,991
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	5,896	5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	99	168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	5,896	34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	99	294
Corporate Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	1,020	12,995
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	1	167
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	0	0
Securities available-for-sale, Total, Estimated Fair Value	1,020	12,995
Securities available-for-sale, Total, Unrealized Loss	1	167
Money Market Funds
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	1,500	1,500
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	50	67
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	0	0
Securities available-for-sale, Total, Estimated Fair Value	1,500	1,500
Securities available-for-sale, Total, Unrealized Loss	50	$ 67
Trust Preferred Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	3,972
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	569
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	0
Securities available-for-sale, Total, Estimated Fair Value	3,972
Securities available-for-sale, Total, Unrealized Loss	$ 569

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