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2. Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Investment securities available for sale
Amortized Cost	$ 239,254	$ 244,924
Estimated Fair Value	244,862	249,946
Mortgage-backed securities
Investment securities available for sale
Amortized Cost	62,488	66,654
Gross Unrealized Gains	1,157	1,221
Gross Unrealized Losses	321	290
Estimated Fair Value	63,324	67,585
U.S. Government sponsored enterprises
Investment securities available for sale
Amortized Cost	39,888	38,188
Gross Unrealized Gains	273	308
Gross Unrealized Losses	262	274
Estimated Fair Value	39,899	38,222
State and political subdivisions
Investment securities available for sale
Amortized Cost	135,128	137,832
Gross Unrealized Gains	4,826	4,176
Gross Unrealized Losses	101	152
Estimated Fair Value	139,853	141,856
Corporate bonds
Investment securities available for sale
Amortized Cost	1,500	1,500
Gross Unrealized Gains	36	33
Gross Unrealized Losses	0	0
Estimated Fair Value	1,536	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	239,254	244,924
Gross Unrealized Gains	6,292	5,738
Gross Unrealized Losses	684	716
Estimated Fair Value	$ 244,862	$ 249,946

X

- Definition

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)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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