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6. Fair Value, Level of Hierarchy (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Estimated Fair Value | $ 210,055 | $ 229,321
Level 1 |  |
Estimated Fair Value | 0 | 0
Level 2 |  |
Estimated Fair Value | 209,805 | 229,071
Level 3 |  |
Estimated Fair Value | 250 | 250
Mortgage-backed securities |  |
Estimated Fair Value | 45,721 | 53,609
Mortgage-backed securities | Level 1 |  |
Estimated Fair Value | 0 | 0
Mortgage-backed securities | Level 2 |  |
Estimated Fair Value | 45,721 | 53,609
Mortgage-backed securities | Level 3 |  |
Estimated Fair Value | 0 | 0
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 37,537 | 40,380
U.S. Government sponsored enterprises | Level 1 |  |
Estimated Fair Value | 0 | 0
U.S. Government sponsored enterprises | Level 2 |  |
Estimated Fair Value | 37,537 | 40,380
U.S. Government sponsored enterprises | Level 3 |  |
Estimated Fair Value | 0 | 0
State and political subdivisions |  |
Estimated Fair Value | 125,535 | 133,570
State and political subdivisions | Level 1 |  |
Estimated Fair Value | 0 | 0
State and political subdivisions | Level 2 |  |
Estimated Fair Value | 125,535 | 133,570
State and political subdivisions | Level 3 |  |
Estimated Fair Value | 0 | 0
Corporate bonds |  |
Estimated Fair Value | 1,012 | 1,512
Corporate bonds | Level 1 |  |
Estimated Fair Value | 0 | 0
Corporate bonds | Level 2 |  |
Estimated Fair Value | 1,012 | 1,512
Corporate bonds | Level 3 |  |
Estimated Fair Value | 0 | 0
Trust preferred securities |  |
Estimated Fair Value | 250 | 250
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 | $ 250

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