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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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