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2. Investment Securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Investment securities available for sale |  |
Amortized Cost | $ 208,921 |
Estimated Fair Value | 210,055 | $ 229,321
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 46,213 | 53,124
Gross Unrealized Gains | 321 | 814
Gross Unrealized Losses | 813 | 329
Estimated Fair Value | 45,721 | 53,609
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 38,528 | 40,504
Gross Unrealized Gains | 10 | 140
Gross Unrealized Losses | 1,001 | 264
Estimated Fair Value | 37,537 | 40,380
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 122,930 | 129,276
Gross Unrealized Gains | 2,749 | 4,310
Gross Unrealized Losses | 144 | 16
Estimated Fair Value | 125,535 | 133,570
Corporate bonds |  |
Investment securities available for sale |  |
Amortized Cost | 1,000 | 1,500
Gross Unrealized Gains | 12 | 12
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,012 | 1,512
Trust preferred securities |  |
Investment securities available for sale |  |
Amortized Cost | 250 | 250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 250 | 250
Total |  |
Investment securities available for sale |  |
Amortized Cost | 208,921 | 224,654
Gross Unrealized Gains | 3,092 | 5,276
Gross Unrealized Losses | 1,958 | 609
Estimated Fair Value | $ 210,055 | $ 229,321

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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 No definition available. + Details
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