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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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

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