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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | $ 69,600 | $ 109,807
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 1,095 | 2,032
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 53,750 | 304,628
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss | 636 | 12,178
Securities available-for-sale, Total, Estimated Fair Value | 123,350 | 414,435
Securities available-for-sale, Total, Unrealized Loss | 1,731 | 14,210
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 294
Obligations Of States And Political Subdivisions |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 230 | 11,837
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 0 | 272
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 1,439 | 22,068
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss | 7 | 780
Securities available-for-sale, Total, Estimated Fair Value | 1,669 | 33,905
Securities available-for-sale, Total, Unrealized Loss | 7 | 1,052
U.S. Government Agencies Mortgage-backed Securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 50,385 | 84,975
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 356 | 1,593
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 52,311 | 282,560
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss | 629 | 11,398
Securities available-for-sale, Total, Estimated Fair Value | 102,696 | 367,535
Securities available-for-sale, Total, Unrealized Loss | 985 | 12,991
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 294
Corporate Securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 15,035 | 12,995
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 144 | 167
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 | 15,035 | 12,995
Securities available-for-sale, Total, Unrealized Loss | 144 | $ 167
Trust Preferred Securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 3,950 |
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 595 |
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 | 3,950 |
Securities available-for-sale, Total, Unrealized Loss | $ 595 |

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