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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale securities, Amortized Cost | $ 172,311 | $ 212,284
Available-for-sale securities, Gross Unrealized Gains | 2,691 | 733
Available-for-sale securities, Gross Unrealized Losses | 214 | 852
Available-for-sale securities, Estimated Fair Value | 174,788 | 212,165
Held-to-maturity securities, Amortized Cost | 3,809 | 4,191
Held-to-maturity securities, Gross Unrealized Gains | 122 | 112
Held-to-maturity securities, Gross Unrealized Losses |  | 60
Held-to-maturity securities, Estimated Fair Value | 3,931 | 4,243
Equity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale securities, Amortized Cost | 648 | 637
Available-for-sale securities, Gross Unrealized Gains | 15 | 4
Available-for-sale securities, Estimated Fair Value | 663 | 641
U.S. Treasury [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale securities, Amortized Cost |  | 5,078
Available-for-sale securities, Gross Unrealized Gains |  | 1
Available-for-sale securities, Estimated Fair Value |  | 5,079
U.S. Government Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale securities, Amortized Cost | 32,423 | 49,630
Available-for-sale securities, Gross Unrealized Gains | 118 | 89
Available-for-sale securities, Gross Unrealized Losses | 111 | 190
Available-for-sale securities, Estimated Fair Value | 32,430 | 49,529
Held-to-maturity securities, Amortized Cost | 2,194 | 2,575
Held-to-maturity securities, Gross Unrealized Gains | 10 |
Held-to-maturity securities, Gross Unrealized Losses |  | 60
Held-to-maturity securities, Estimated Fair Value | 2,204 | 2,515
States and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Held-to-maturity securities, Amortized Cost | 1,615 | 1,616
Held-to-maturity securities, Gross Unrealized Gains | 112 | 112
Held-to-maturity securities, Estimated Fair Value | 1,727 | 1,728
Mortgage-backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale securities, Amortized Cost | 139,240 | 156,939
Available-for-sale securities, Gross Unrealized Gains | 2,558 | 639
Available-for-sale securities, Gross Unrealized Losses | 103 | 662
Available-for-sale securities, Estimated Fair Value | $ 141,695 | $ 156,916

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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=73527792&loc=d3e27161-111563 + Details
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