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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | $ 75,169 | $ 88,937
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,346 | 1,949
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 70 | 76
Securities held-to-maturity, Estimated Fair Value | 76,445 | 90,810
US Government Agencies Debt Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 71,169 | 84,937
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,346 | 1,949
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 70 | 76
Securities held-to-maturity, Estimated Fair Value | 72,445 | 86,810
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 | 14,352 | 12,915
Securities held-to-maturity, Estimated Fair Value | $ 14,352 | $ 12,915

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