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6. Fair Value, Level of Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Estimated Fair Value | $ 235,736 | $ 249,946
Level 1 |  |
Estimated Fair Value | 0 | 0
Level 2 |  |
Estimated Fair Value | 235,486 | 249,196
Level 3 |  |
Estimated Fair Value | 250 | 750
Mortgage-backed securities |  |
Estimated Fair Value | 56,893 | 67,585
Mortgage-backed securities | Level 1 |  |
Estimated Fair Value | 0 | 0
Mortgage-backed securities | Level 2 |  |
Estimated Fair Value | 56,893 | 67,585
Mortgage-backed securities | Level 3 |  |
Estimated Fair Value | 0 | 0
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 40,954 | 38,222
U.S. Government sponsored enterprises | Level 1 |  |
Estimated Fair Value | 0 | 0
U.S. Government sponsored enterprises | Level 2 |  |
Estimated Fair Value | 40,954 | 38,222
U.S. Government sponsored enterprises | Level 3 |  |
Estimated Fair Value | 0 | 0
State and political subdivisions |  |
Estimated Fair Value | 136,109 | 141,856
State and political subdivisions | Level 1 |  |
Estimated Fair Value | 0 | 0
State and political subdivisions | Level 2 |  |
Estimated Fair Value | 136,109 | 141,856
State and political subdivisions | Level 3 |  |
Estimated Fair Value | 0 | 0
Corporate bonds |  |
Estimated Fair Value | 1,530 | 1,533
Corporate bonds | Level 1 |  |
Estimated Fair Value | 0 | 0
Corporate bonds | Level 2 |  |
Estimated Fair Value | 1,530 | 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

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- 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 + Details
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