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2. Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Investment securities available for sale
Amortized Cost	$ 206,300
Estimated Fair Value	205,966	$ 229,321
Mortgage-backed securities
Investment securities available for sale
Amortized Cost	47,017	53,124
Gross Unrealized Gains	250	814
Gross Unrealized Losses	977	329
Estimated Fair Value	46,290	53,609
U.S. Government sponsored enterprises
Investment securities available for sale
Amortized Cost	36,278	40,504
Gross Unrealized Gains	1	140
Gross Unrealized Losses	1,278	264
Estimated Fair Value	35,001	40,380
State and political subdivisions
Investment securities available for sale
Amortized Cost	121,755	129,276
Gross Unrealized Gains	1,911	4,310
Gross Unrealized Losses	252	16
Estimated Fair Value	123,414	133,570
Corporate bonds
Investment securities available for sale
Amortized Cost	1,000	1,500
Gross Unrealized Gains	11	12
Gross Unrealized Losses	0	0
Estimated Fair Value	1,011	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	206,300	224,654
Gross Unrealized Gains	2,173	5,276
Gross Unrealized Losses	2,507	609
Estimated Fair Value	$ 205,966	$ 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
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