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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | $ 12,978 | $ 111,307
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 625 | 2,099
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 364,004 | 304,628
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss | 7,226 | 12,178
Securities available-for-sale, Total, Estimated Fair Value | 376,982 | 415,935
Securities available-for-sale, Total, Unrealized Loss | 7,851 | 14,277
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 5,896 | 5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 99 | 168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 5,896 | 34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 99 | 294
Obligations Of States And Political Subdivisions |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 832 | 11,837
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 3 | 272
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 20,922 | 22,068
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss | 282 | 780
Securities available-for-sale, Total, Estimated Fair Value | 21,754 | 33,905
Securities available-for-sale, Total, Unrealized Loss | 285 | 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 | 5,654 | 84,975
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 2 | 1,593
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 343,082 | 282,560
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss | 6,944 | 11,398
Securities available-for-sale, Total, Estimated Fair Value | 348,736 | 367,535
Securities available-for-sale, Total, Unrealized Loss | 6,946 | 12,991
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 28,274
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 126
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 5,896 | 5,960
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 99 | 168
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 5,896 | 34,234
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 99 | 294
Corporate Securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 1,020 | 12,995
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 1 | 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 | 1,020 | 12,995
Securities available-for-sale, Total, Unrealized Loss | 1 | 167
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 | 50 | 67
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 | 50 | $ 67
Trust Preferred Securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 3,972 |
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss | 569 |
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 | 3,972 |
Securities available-for-sale, Total, Unrealized Loss | $ 569 |

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