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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value $ 297,867 $ 187,052
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss 8,239 2,054
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value 172,985 162,016
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss 10,874 5,871
Securities available-for-sale, Total, Estimated Fair Value 470,852 349,068
Securities available-for-sale, Total, Unrealized Loss 19,113 7,925
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 50,941 7,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 402 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 50,941 7,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 402 25
Obligations Of States And Political Subdivisions    
Schedule of Investments [Line Items]    
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value 29,391 4,913
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss 347 28
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value 18,880 19,440
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss 809 379
Securities available-for-sale, Total, Estimated Fair Value 48,271 24,353
Securities available-for-sale, Total, Unrealized Loss 1,156 407
U.S. Government Agencies Mortgage-backed Securities    
Schedule of Investments [Line Items]    
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value 252,029 172,807
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss 7,667 1,887
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value 154,105 140,226
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss 10,065 5,418
Securities available-for-sale, Total, Estimated Fair Value 406,134 313,033
Securities available-for-sale, Total, Unrealized Loss 17,732 7,305
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 50,941 7,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 402 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 50,941 7,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 402 25
Corporate Securities    
Schedule of Investments [Line Items]    
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value 14,947 3,357
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss 155 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 14,947 5,707
Securities available-for-sale, Total, Unrealized Loss 155 123
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 70 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 $ 70 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