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2. Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Investment securities available for sale |  |
Amortized Cost | $ 182,251 | $ 193,296
Estimated Fair Value | 184,428 | 194,578
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 53,390 | 52,145
Gross Unrealized Gains | 635 | 516
Gross Unrealized Losses | 394 | 558
Estimated Fair Value | 53,631 | 52,103
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 34,045 | 35,356
Gross Unrealized Gains | 138 | 71
Gross Unrealized Losses | 569 | 793
Estimated Fair Value | 33,614 | 34,634
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 94,566 | 105,545
Gross Unrealized Gains | 2,379 | 2,089
Gross Unrealized Losses | 12 | 43
Estimated Fair Value | 96,933 | 107,591
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 | 182,251 | 193,296
Gross Unrealized Gains | 3,152 | 2,676
Gross Unrealized Losses | 975 | 1,394
Estimated Fair Value | $ 184,428 | $ 194,578

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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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