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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | $ 178,415 | $ 165,462
Available-for-sale securities, Gross Unrealized Gains |  | 519 | 319
Available-for-sale securities, Gross Unrealized Losses |  | 862 | 1,879
Available-for-sale securities, Estimated Fair Value |  | 178,072 | 163,902
Held-to-maturity securities, Amortized Cost |  | 6,615 | 6,704
Held-to-maturity securities, Gross Unrealized Gains |  | 240 | 102
Held-to-maturity securities, Estimated Fair Value |  | 6,855 | 6,806
Equity [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 655 | 652
Available-for-sale securities, Gross Unrealized Losses |  | 7 | 12
Available-for-sale securities, Estimated Fair Value |  | 648 | 640
Held-to-maturity securities, Amortized Cost |  | 3,000 |
Other Equity Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost | [1] | 3,000 | 3,000
Available-for-sale securities, Gross Unrealized Gains | [1] | 139 |
Available-for-sale securities, Estimated Fair Value | [1] | 3,139 | 3,000
U.S. Government Agencies [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 43,311 | 34,320
Available-for-sale securities, Gross Unrealized Gains |  | 38 | 56
Available-for-sale securities, Gross Unrealized Losses |  | 74 | 58
Available-for-sale securities, Estimated Fair Value |  | 43,275 | 34,318
Held-to-maturity securities, Amortized Cost |  | 2,001 | 2,089
Held-to-maturity securities, Gross Unrealized Gains |  | 29 | 26
Held-to-maturity securities, Estimated Fair Value |  | 2,030 | 2,115
States and Political Subdivisions [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Held-to-maturity securities, Amortized Cost |  | 1,614 | 1,615
Held-to-maturity securities, Gross Unrealized Gains |  | 72 | 76
Held-to-maturity securities, Estimated Fair Value |  | 1,686 | 1,691
Mortgage-backed [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 134,449 | 130,490
Available-for-sale securities, Gross Unrealized Gains |  | 481 | 263
Available-for-sale securities, Gross Unrealized Losses |  | 781 | 1,809
Available-for-sale securities, Estimated Fair Value |  | $ 134,149 | $ 128,944
[1] | On December 15, 2016, the Company bought $3.0 million in subordinated notes from a local regional bank which it intends to hold to maturity of December 30, 2026.

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