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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Securities Financing Transactions Disclosures [Abstract] |  |  |  |
Held to maturity securities | $ 71,096,000 | $ 71,096,000 |  | $ 0
Available-for-sale Securities Pledged as Collateral | 126,032,000 | 126,032,000 |  | $ 131,469,000
Available-for-sale Securities, Gross Realized Gains | 77,000 | 200,000 | $ 450,000 |
Available-for-sale Securities, Gross Realized Losses | $ (65,000) | $ (180,000) | $ (237,000) |

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