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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | $ 64,449 | $ 75,169
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,222 | 1,346
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 25 | 70
Securities held-to-maturity, Estimated Fair Value | 65,646 | 76,445
US Government Agencies Debt Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 60,449 | 71,169
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,222 | 1,346
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 25 | 70
Securities held-to-maturity, Estimated Fair Value | 61,646 | 72,445
Trust preferred securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 4,000 | 4,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Securities held-to-maturity, Estimated Fair Value | 4,000 | 4,000
Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 14,147 | 14,352
Securities held-to-maturity, Estimated Fair Value | $ 14,147 | $ 14,352

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