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2. Investment securities, Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Estimated Fair Value | $ 194,578 | $ 229,321
Mortgage-backed securities |  |
Estimated Fair Value | 52,103 | 53,609
Level 1 valuation | 0 | 0
Level 2 valuation | 52,103 | 53,609
Level 3 valuation | 0 | 0
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 34,634 | 40,380
Level 1 valuation | 0 | 0
Level 2 valuation | 34,634 | 40,380
Level 3 valuation | 0 | 0
State and political subdivisions |  |
Estimated Fair Value | 107,591 | 133,570
Level 1 valuation | 0 | 0
Level 2 valuation | 107,591 | 133,570
Level 3 valuation | 0 | 0
Corporate bonds |  |
Estimated Fair Value |  | 1,512
Level 1 valuation |  | 0
Level 2 valuation |  | 1,512
Level 3 valuation |  | 0
Trust preferred securities |  |
Estimated Fair Value | 250 | 250
Level 1 valuation | 0 | 0
Level 2 valuation | 0 | 0
Level 3 valuation | $ 250 | $ 250

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