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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 15, 2016 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost |  |  | $ 213,400 | $ 165,462
Available-for-sale securities, Gross Unrealized Gains |  |  | 724 | 319
Available-for-sale securities, Gross Unrealized Losses |  |  | 734 | 1,879
Available-for-sale securities, Estimated Fair Value |  |  | 213,390 | 163,902
Held-to-maturity securities, Amortized Cost |  |  | 6,241 | 6,704
Held-to-maturity securities, Gross Unrealized Gains |  |  | 210 | 102
Held-to-maturity securities, Estimated Fair Value |  |  | 6,451 | 6,806
Equity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost |  |  | 662 | 652
Available-for-sale securities, Gross Unrealized Losses |  |  |  | 12
Available-for-sale securities, Estimated Fair Value |  |  | 662 | 640
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] |  | 107 |
Available-for-sale securities, Estimated Fair Value | [1] |  | 3,107 | 3,000
Floating interest rate |  | 6.50% |  |
U.S. Government Agencies [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost |  |  | 52,093 | 34,320
Available-for-sale securities, Gross Unrealized Gains |  |  | 64 | 56
Available-for-sale securities, Gross Unrealized Losses |  |  | 154 | 58
Available-for-sale securities, Estimated Fair Value |  |  | 52,003 | 34,318
Held-to-maturity securities, Amortized Cost |  |  | 1,837 | 2,089
Held-to-maturity securities, Gross Unrealized Gains |  |  | 42 | 26
Held-to-maturity securities, Estimated Fair Value |  |  | 1,879 | 2,115
States and Political Subdivisions [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Held-to-maturity securities, Amortized Cost |  |  | 1,404 | 1,615
Held-to-maturity securities, Gross Unrealized Gains |  |  | 61 | 76
Held-to-maturity securities, Estimated Fair Value |  |  | 1,465 | 1,691
Mortgage-backed [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Available-for-sale securities, Amortized Cost |  |  | 160,645 | 130,490
Available-for-sale securities, Gross Unrealized Gains |  |  | 660 | 263
Available-for-sale securities, Gross Unrealized Losses |  |  | 580 | 1,809
Available-for-sale securities, Estimated Fair Value |  |  | $ 160,725 | $ 128,944
[1] | On December 15, 2016, the Company bought $3.0 million in subordinated notes with a fixed to floating rate of 6.5% from a local regional bank which it intends to hold to maturity of December 30, 2026.

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