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6. Fair Value, Level of Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Estimated Fair Value | $ 244,862 | $ 249,946
Level 1 |  |
Estimated Fair Value | 0 | 0
Level 2 |  |
Estimated Fair Value | 244,613 | 249,196
Level 3 |  |
Estimated Fair Value | 250 | 750
Mortgage-backed securities |  |
Estimated Fair Value | 63,324 | 67,585
Mortgage-backed securities | Level 1 |  |
Estimated Fair Value | 0 | 0
Mortgage-backed securities | Level 2 |  |
Estimated Fair Value | 63,324 | 67,585
Mortgage-backed securities | Level 3 |  |
Estimated Fair Value | 0 | 0
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 39,899 | 38,222
U.S. Government sponsored enterprises | Level 1 |  |
Estimated Fair Value | 0 | 0
U.S. Government sponsored enterprises | Level 2 |  |
Estimated Fair Value | 39,899 | 38,222
U.S. Government sponsored enterprises | Level 3 |  |
Estimated Fair Value | 0 | 0
State and political subdivisions |  |
Estimated Fair Value | 139,853 | 141,856
State and political subdivisions | Level 1 |  |
Estimated Fair Value | 0 | 0
State and political subdivisions | Level 2 |  |
Estimated Fair Value | 139,854 | 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

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