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2. Investment Securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Investment securities available for sale |  |
Amortized Cost | $ 266,522 | $ 272,167
Estimated Fair Value | 273,469 | 281,099
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 80,685 | 88,496
Gross Unrealized Gains | 1,969 | 1,766
Gross Unrealized Losses | 9 | 52
Estimated Fair Value | 82,645 | 90,210
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 38,934 | 33,766
Gross Unrealized Gains | 380 | 418
Gross Unrealized Losses | 143 | 136
Estimated Fair Value | 39,171 | 34,048
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 143,458 | 145,938
Gross Unrealized Gains | 4,696 | 6,534
Gross Unrealized Losses | 712 | 226
Estimated Fair Value | 147,442 | 152,246
Corporate bonds |  |
Investment securities available for sale |  |
Amortized Cost | 1,947 | 2,469
Gross Unrealized Gains | 12 | 16
Gross Unrealized Losses | 5 | 18
Estimated Fair Value | 1,954 | 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 | 759 | 630
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,507 | 1,378
Total |  |
Investment securities available for sale |  |
Amortized Cost | 266,522 | 272,167
Gross Unrealized Gains | 7,816 | 9,364
Gross Unrealized Losses | 869 | 432
Estimated Fair Value | $ 273,469 | $ 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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