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2. Investment Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Investment securities available for sale |  |
Amortized Cost | $ 244,924 |
Estimated Fair Value | 249,946 | $ 268,530
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 66,654 | 76,406
Gross Unrealized Gains | 1,221 | 1,526
Gross Unrealized Losses | 290 | 45
Estimated Fair Value | 67,585 | 77,887
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 38,188 | 38,173
Gross Unrealized Gains | 308 | 399
Gross Unrealized Losses | 274 | 155
Estimated Fair Value | 38,222 | 38,417
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 137,832 | 141,500
Gross Unrealized Gains | 4,176 | 6,817
Gross Unrealized Losses | 152 | 72
Estimated Fair Value | 141,856 | 148,245
Corporate bonds |  |
Investment securities available for sale |  |
Amortized Cost | 1,500 | 1,928
Gross Unrealized Gains | 33 | 0
Gross Unrealized Losses | 0 | 22
Estimated Fair Value | 1,533 | 1,906
Trust preferred securities |  |
Investment securities available for sale |  |
Amortized Cost | 750 | 750
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 750 | 750
Equity securities |  |
Investment securities available for sale |  |
Amortized Cost |  | 748
Gross Unrealized Gains |  | 577
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 1,325
Total |  |
Investment securities available for sale |  |
Amortized Cost | 244,924 | 259,505
Gross Unrealized Gains | 5,738 | 9,319
Gross Unrealized Losses | 716 | 294
Estimated Fair Value | $ 249,946 | $ 268,530

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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