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2. Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Investment securities available for sale
Amortized Cost	$ 211,246
Estimated Fair Value	213,299	$ 229,321
Mortgage-backed securities
Investment securities available for sale
Amortized Cost	49,731	53,124
Gross Unrealized Gains	559	814
Gross Unrealized Losses	722	329
Estimated Fair Value	49,568	53,609
U.S. Government sponsored enterprises
Investment securities available for sale
Amortized Cost	38,466	40,504
Gross Unrealized Gains	24	140
Gross Unrealized Losses	649	264
Estimated Fair Value	37,841	40,380
State and political subdivisions
Investment securities available for sale
Amortized Cost	121,299	129,276
Gross Unrealized Gains	2,994	4,310
Gross Unrealized Losses	152	16
Estimated Fair Value	124,141	133,570
Corporate bonds
Investment securities available for sale
Amortized Cost	1,500	1,500
Gross Unrealized Gains	0	12
Gross Unrealized Losses	1	0
Estimated Fair Value	1,499	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	211,246	224,654
Gross Unrealized Gains	3,577	5,276
Gross Unrealized Losses	1,524	609
Estimated Fair Value	$ 213,299	$ 229,321

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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
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

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