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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	$ 301,946	$ 187,052
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	9,232	2,054
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	210,369	162,016
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	14,981	5,871
Securities available-for-sale, Total, Estimated Fair Value	512,315	349,068
Securities available-for-sale, Total, Unrealized Loss	24,213	7,925
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	52,841	7,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	971	25
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	52,841	7,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	971	25
Obligations Of States And Political Subdivisions
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	45,560	4,913
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	653	28
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	19,197	19,440
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	1,020	379
Securities available-for-sale, Total, Estimated Fair Value	64,757	24,353
Securities available-for-sale, Total, Unrealized Loss	1,673	407
U.S. Government Agencies Mortgage-backed Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	239,964	172,807
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	8,325	1,887
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	191,172	140,226
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	13,961	5,418
Securities available-for-sale, Total, Estimated Fair Value	431,136	313,033
Securities available-for-sale, Total, Unrealized Loss	22,286	7,305
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	52,841	7,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	971	25
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	52,841	7,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	971	25
Corporate Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	14,922	3,357
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	172	49
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0	2,350
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	0	74
Securities available-for-sale, Total, Estimated Fair Value	14,922	5,707
Securities available-for-sale, Total, Unrealized Loss	172	123
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	82	36
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	$ 82	36
Trust Preferred Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value		4,475
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss		54
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		4,475
Securities available-for-sale, Total, Unrealized Loss		$ 54

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