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2. Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Investment securities available for sale
Amortized Cost	$ 228,687	$ 244,924
Estimated Fair Value	235,736	249,946
Mortgage-backed securities
Investment securities available for sale
Amortized Cost	55,947	66,654
Gross Unrealized Gains	1,142	1,221
Gross Unrealized Losses	196	290
Estimated Fair Value	56,893	67,585
U.S. Government sponsored enterprises
Investment securities available for sale
Amortized Cost	40,815	38,188
Gross Unrealized Gains	290	308
Gross Unrealized Losses	151	274
Estimated Fair Value	40,954	38,222
State and political subdivisions
Investment securities available for sale
Amortized Cost	130,175	137,832
Gross Unrealized Gains	5,954	4,176
Gross Unrealized Losses	20	152
Estimated Fair Value	136,109	141,856
Corporate bonds
Investment securities available for sale
Amortized Cost	1,500	1,500
Gross Unrealized Gains	30	33
Gross Unrealized Losses	0	0
Estimated Fair Value	1,530	1,533
Trust preferred securities
Investment securities available for sale
Amortized Cost	250	750
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	250	750
Total
Investment securities available for sale
Amortized Cost	228,687	244,924
Gross Unrealized Gains	7,416	5,738
Gross Unrealized Losses	367	716
Estimated Fair Value	$ 235,736	$ 249,946

X

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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
-Subparagraph (b)
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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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.

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-Name Accounting Standards Codification
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