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2. Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Investment securities available for sale
Amortized Cost	$ 253,594
Estimated Fair Value	264,092	$ 268,530
Mortgage-backed securities
Investment securities available for sale
Amortized Cost	72,066	76,406
Gross Unrealized Gains	1,836	1,526
Gross Unrealized Losses	23	45
Estimated Fair Value	73,879	77,887
U.S. Government sponsored enterprises
Investment securities available for sale
Amortized Cost	37,021	38,173
Gross Unrealized Gains	622	399
Gross Unrealized Losses	126	155
Estimated Fair Value	37,517	38,417
State and political subdivisions
Investment securities available for sale
Amortized Cost	141,091	141,500
Gross Unrealized Gains	7,688	6,817
Gross Unrealized Losses	14	72
Estimated Fair Value	148,765	148,245
Corporate bonds
Investment securities available for sale
Amortized Cost	1,918	1,928
Gross Unrealized Gains	11	0
Gross Unrealized Losses	18	22
Estimated Fair Value	1,911	1,906
Trust preferred securities
Investment securities available for sale
Amortized Cost	750	750
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	750	750
Equity securities
Investment securities available for sale
Amortized Cost	748	748
Gross Unrealized Gains	522	577
Gross Unrealized Losses	0	0
Estimated Fair Value	1,270	1,325
Total
Investment securities available for sale
Amortized Cost	253,594	259,505
Gross Unrealized Gains	10,679	9,319
Gross Unrealized Losses	181	294
Estimated Fair Value	$ 264,092	$ 268,530

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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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