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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |
Equity securities, fair value | $ 488,000 | $ 488,000 | $ 506,000
Equity securities sold | 0 | 0 |
Available-for-sale Securities Pledged as Collateral | $ 240,070,000 | $ 240,070,000 | $ 141,465,000
Debt Securities, Available-for-sale, Restriction Type [Extensible List] | us-gaap:CollateralPledgedMember | us-gaap:CollateralPledgedMember | us-gaap:CollateralPledgedMember
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity securities, fair value | $ 488,000 | $ 488,000 | $ 506,000
Accumulated Other Comprehensive Loss [Member] | Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Net unrealized gains recongized |  |  | $ 44,000,000

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