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2. Investment Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Investment securities available for sale |  |
Amortized Cost | $ 260,708 | $ 272,167
Estimated Fair Value | 268,821 | 281,099
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 75,386 | 88,496
Gross Unrealized Gains | 2,098 | 1,766
Gross Unrealized Losses | 18 | 52
Estimated Fair Value | 77,466 | 90,210
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 38,793 | 33,766
Gross Unrealized Gains | 505 | 418
Gross Unrealized Losses | 129 | 136
Estimated Fair Value | 39,169 | 34,048
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 143,094 | 145,938
Gross Unrealized Gains | 5,566 | 6,534
Gross Unrealized Losses | 338 | 226
Estimated Fair Value | 148,322 | 152,246
Corporate bonds |  |
Investment securities available for sale |  |
Amortized Cost | 1,937 | 2,469
Gross Unrealized Gains | 4 | 16
Gross Unrealized Losses | 1 | 18
Estimated Fair Value | 1,940 | 2,467
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 | 748
Gross Unrealized Gains | 426 | 630
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,174 | 1,378
Total |  |
Investment securities available for sale |  |
Amortized Cost | 260,708 | 272,167
Gross Unrealized Gains | 8,599 | 9,364
Gross Unrealized Losses | 486 | 432
Estimated Fair Value | $ 268,821 | $ 281,099

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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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + Details
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