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2. Investment Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Investment securities available for sale |  |
Amortized Cost | $ 228,687 | $ 244,924
Estimated Fair Value | 235,736 | 249,946
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 55,947 | 66,654
Gross Unrealized Gains | 1,142 | 1,221
Gross Unrealized Losses | 196 | 290
Estimated Fair Value | 56,893 | 67,585
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 40,815 | 38,188
Gross Unrealized Gains | 290 | 308
Gross Unrealized Losses | 151 | 274
Estimated Fair Value | 40,954 | 38,222
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 130,175 | 137,832
Gross Unrealized Gains | 5,954 | 4,176
Gross Unrealized Losses | 20 | 152
Estimated Fair Value | 136,109 | 141,856
Corporate bonds |  |
Investment securities available for sale |  |
Amortized Cost | 1,500 | 1,500
Gross Unrealized Gains | 30 | 33
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,530 | 1,533
Trust preferred securities |  |
Investment securities available for sale |  |
Amortized Cost | 250 | 750
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 250 | 750
Total |  |
Investment securities available for sale |  |
Amortized Cost | 228,687 | 244,924
Gross Unrealized Gains | 7,416 | 5,738
Gross Unrealized Losses | 367 | 716
Estimated Fair Value | $ 235,736 | $ 249,946

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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=75030427&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=82897076&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=82896770&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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