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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 15, 2016 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | $ 187,822 | $ 198,670
Available-for-sale securities, Gross Unrealized Gains |  | 136 | 180
Available-for-sale securities, Gross Unrealized Losses |  | 4,699 | 1,895
Available-for-sale securities, Estimated Fair Value |  | 183,259 | 196,955
Held-to-maturity securities, Amortized Cost |  | 6,162 | 6,247
Held-to-maturity securities, Gross Unrealized Gains |  | 62 | 144
Held-to-maturity securities, Gross Unrealized Losses |  | 1 |
Held-to-maturity securities, Estimated Fair Value |  | 6,223 | 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 |  | 30 | 76
Available-for-sale securities, Estimated Fair Value |  | 3,030 | 3,076
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 |  | 42,691 | 45,806
Available-for-sale securities, Gross Unrealized Gains |  | 14 | 23
Available-for-sale securities, Gross Unrealized Losses |  | 792 | 497
Available-for-sale securities, Estimated Fair Value |  | 41,913 | 45,332
Held-to-maturity securities, Amortized Cost |  | 1,759 | 1,844
Held-to-maturity securities, Gross Unrealized Gains |  |  | 21
Held-to-maturity securities, Gross Unrealized Losses |  | 1 |
Held-to-maturity securities, Estimated Fair Value |  | 1,758 | 1,865
States and Political Subdivisions [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Held-to-maturity securities, Amortized Cost |  | 1,403 | 1,403
Held-to-maturity securities, Gross Unrealized Gains |  | 32 | 47
Held-to-maturity securities, Estimated Fair Value |  | 1,435 | 1,450
Mortgage-backed [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Available-for-sale securities, Amortized Cost |  | 145,131 | 152,198
Available-for-sale securities, Gross Unrealized Gains |  | 122 | 157
Available-for-sale securities, Gross Unrealized Losses |  | 3,907 | 1,390
Available-for-sale securities, Estimated Fair Value |  | $ 141,346 | $ 150,965

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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