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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 15, 2016 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  |  | $ 198,670
Available-for-sale securities, Gross Unrealized Gains |  |  | 180
Available-for-sale securities, Gross Unrealized Losses |  |  | 1,895
Available-for-sale securities, Estimated Fair Value |  | $ 176,218 | 196,955
Held-to-maturity securities, Amortized Cost |  | 6,168 | 6,247
Held-to-maturity securities, Gross Unrealized Gains |  | 24 | 144
Held-to-maturity securities, Gross Unrealized Losses |  | 30 |
Held-to-maturity securities, Estimated Fair Value |  | 6,162 | 6,391
Equity [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  |  | 666
Available-for-sale securities, Gross Unrealized Losses |  |  | 8
Available-for-sale securities, Estimated Fair Value |  |  | 658
Other Equity Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 3,000 | 3,000
Available-for-sale securities, Gross Unrealized Gains |  |  | 76
Available-for-sale securities, Gross Unrealized Losses |  | 20 |
Available-for-sale securities, Estimated Fair Value |  | 2,980 | 3,076
Floating interest rate | 6.50% |  |
Debt Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 180,689 |
Available-for-sale securities, Gross Unrealized Gains |  | 139 |
Available-for-sale securities, Gross Unrealized Losses |  | 5,262 |
Available-for-sale securities, Estimated Fair Value |  | 175,566 |
U.S. Government Agencies [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 42,578 | 45,806
Available-for-sale securities, Gross Unrealized Gains |  | 7 | 23
Available-for-sale securities, Gross Unrealized Losses |  | 858 | 497
Available-for-sale securities, Estimated Fair Value |  | 41,727 | 45,332
Held-to-maturity securities, Amortized Cost |  | 1,766 | 1,844
Held-to-maturity securities, Gross Unrealized Gains |  |  | 21
Held-to-maturity securities, Gross Unrealized Losses |  | 10 |
Held-to-maturity securities, Estimated Fair Value |  | 1,756 | 1,865
States and Political Subdivisions [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Held-to-maturity securities, Amortized Cost |  | 1,402 | 1,403
Held-to-maturity securities, Gross Unrealized Gains |  | 24 | 47
Held-to-maturity securities, Estimated Fair Value |  | 1,426 | 1,450
Mortgage-backed [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 138,111 | 152,198
Available-for-sale securities, Gross Unrealized Gains |  | 132 | 157
Available-for-sale securities, Gross Unrealized Losses |  | 4,404 | 1,390
Available-for-sale securities, Estimated Fair Value |  | $ 133,839 | $ 150,965

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