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2. Investment Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Investment securities available for sale |  |
Amortized Cost | $ 251,125 | $ 259,505
Estimated Fair Value | 262,423 | 268,530
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 71,359 | 76,406
Gross Unrealized Gains | 2,083 | 1,526
Gross Unrealized Losses | 49 | 45
Estimated Fair Value | 73,393 | 77,887
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 38,575 | 38,173
Gross Unrealized Gains | 743 | 399
Gross Unrealized Losses | 240 | 155
Estimated Fair Value | 39,078 | 38,417
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 138,672 | 141,500
Gross Unrealized Gains | 8,481 | 6,817
Gross Unrealized Losses | 11 | 72
Estimated Fair Value | 147,142 | 148,245
Corporate bonds |  |
Investment securities available for sale |  |
Amortized Cost | 1,505 | 1,928
Gross Unrealized Gains | 20 | 0
Gross Unrealized Losses | 0 | 22
Estimated Fair Value | 1,525 | 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 | 264 | 748
Gross Unrealized Gains | 271 | 577
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 535 | 1,325
Total |  |
Investment securities available for sale |  |
Amortized Cost | 251,125 | 259,505
Gross Unrealized Gains | 11,598 | 9,319
Gross Unrealized Losses | 300 | 294
Estimated Fair Value | $ 262,423 | $ 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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