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6. Fair Value, Level of Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Estimated Fair Value	$ 241,320	$ 249,946
Level 1
Estimated Fair Value	0	0
Level 2
Estimated Fair Value	241,070	249,196
Level 3
Estimated Fair Value	250	750
Mortgage-backed securities
Estimated Fair Value	60,377	67,585
Mortgage-backed securities | Level 1
Estimated Fair Value	0	0
Mortgage-backed securities | Level 2
Estimated Fair Value	60,377	67,585
Mortgage-backed securities | Level 3
Estimated Fair Value	0	0
U.S. Government sponsored enterprises
Estimated Fair Value	39,627	38,222
U.S. Government sponsored enterprises | Level 1
Estimated Fair Value	0	0
U.S. Government sponsored enterprises | Level 2
Estimated Fair Value	39,627	38,222
U.S. Government sponsored enterprises | Level 3
Estimated Fair Value	0	0
State and political subdivisions
Estimated Fair Value	139,530	141,856
State and political subdivisions | Level 1
Estimated Fair Value	0	0
State and political subdivisions | Level 2
Estimated Fair Value	139,530	141,856
State and political subdivisions | Level 3
Estimated Fair Value	0	0
Corporate bonds
Estimated Fair Value	1,536	1,533
Corporate bonds | Level 1
Estimated Fair Value	0	0
Corporate bonds | Level 2
Estimated Fair Value	1,536	1,533
Corporate bonds | Level 3
Estimated Fair Value	0	0
Trust preferred securities
Estimated Fair Value	250	750
Trust preferred securities | Level 1
Estimated Fair Value	0	0
Trust preferred securities | Level 2
Estimated Fair Value	0	0
Trust preferred securities | Level 3
Estimated Fair Value	$ 250	$ 750

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=75030427&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
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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