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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Sep. 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 | $ 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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