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2. Investment securities, Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Estimated Fair Value | $ 249,946 | $ 268,530
Mortgage-backed securities |  |
Estimated Fair Value | 67,585 | 77,887
Level 1 valuation | 0 | 0
Level 2 valuation | 67,585 | 77,887
Level 3 valuation | 0 | 0
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 38,222 | 38,417
Level 1 valuation | 0 | 0
Level 2 valuation | 38,222 | 38,417
Level 3 valuation | 0 | 0
State and political subdivisions |  |
Estimated Fair Value | 141,856 | 148,245
Level 1 valuation | 0 | 0
Level 2 valuation | 141,856 | 148,245
Level 3 valuation | 0 | 0
Corporate bonds |  |
Estimated Fair Value | 1,533 | 1,906
Level 1 valuation | 0 | 0
Level 2 valuation | 1,533 | 1,906
Level 3 valuation | 0 | 0
Trust preferred securities |  |
Estimated Fair Value | 750 | 750
Level 1 valuation | 0 | 0
Level 2 valuation | 0 | 0
Level 3 valuation | $ 750 | 750
Equity securities |  |
Estimated Fair Value |  | 1,325
Level 1 valuation |  | 1,325
Level 2 valuation |  | 0
Level 3 valuation |  | $ 0

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