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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | $ 111,307 | $ 187,052
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,099 | 2,054
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 304,628 | 162,016
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12,178 | 5,871
Securities available-for-sale, Total, Estimated Fair Value | 415,935 | 349,068
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 14,277 | 7,925
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 28,274 | 7,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 126 | 25
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 5,960 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 168 | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 34,234 | 7,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 294 | 25
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 11,837 | 4,913
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 272 | 28
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 22,068 | 19,440
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 780 | 379
Securities available-for-sale, Total, Estimated Fair Value | 33,905 | 24,353
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1,052 | 407
U.S. Government agencies |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 84,975 | 172,807
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,593 | 1,887
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 282,560 | 140,226
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 11,398 | 5,418
Securities available-for-sale, Total, Estimated Fair Value | 367,535 | 313,033
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 12,991 | 7,305
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 28,274 | 7,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 126 | 25
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 5,960 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 168 | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 34,234 | 7,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 294 | 25
Trust preferred securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value |  | 4,475
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 54
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Securities available-for-sale, Total, Estimated Fair Value |  | 4,475
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 54
Corporate securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 12,995 | 3,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 167 | 49
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 0 | 2,350
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 74
Securities available-for-sale, Total, Estimated Fair Value | 12,995 | 5,707
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 167 | 123
Investment funds |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 1,500 | 1,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 67 | 36
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Securities available-for-sale, Total, Estimated Fair Value | 1,500 | 1,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 67 | $ 36

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