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2. Investment securities, Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Estimated Fair Value | $ 268,530 | $ 281,099
Mortgage-backed securities |  |
Estimated Fair Value | 77,887 | 90,210
Level 1 valuation | 0 | 0
Level 2 valuation | 77,887 | 90,210
Level 3 valuation | 0 | 0
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 38,417 | 34,048
Level 1 valuation | 0 | 0
Level 2 valuation | 38,417 | 34,048
Level 3 valuation | 0 | 0
State and political subdivisions |  |
Estimated Fair Value | 148,245 | 152,246
Level 1 valuation | 0 | 0
Level 2 valuation | 148,245 | 152,246
Level 3 valuation | 0 | 0
Corporate bonds |  |
Estimated Fair Value | 1,906 | 2,467
Level 1 valuation | 0 | 0
Level 2 valuation | 1,906 | 2,467
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 | 1,378
Level 1 valuation | 1,325 | 1,378
Level 2 valuation | 0 | 0
Level 3 valuation | $ 0 | $ 0

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