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6. Fair Value Measurements, Level of Hierarchy (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Estimated Fair Value | $ 297,165 | $ 297,890
Mortgage-backed securities |  |
Estimated Fair Value | 117,514 | 123,977
Level 2 valuation | 117,514 | 123,977
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 25,101 | 22,143
Level 2 valuation | 25,101 | 22,143
State and political subdivisions |  |
Estimated Fair Value | 148,629 | 145,368
Level 2 valuation | 148,629 | 145,368
Corporate bonds |  |
Estimated Fair Value | 3,487 | 3,463
Level 2 valuation | 3,487 | 3,463
Trust preferred securities |  |
Estimated Fair Value | 750 | 1,250
Level 3 valuation | 750 | 1,250
Equity securities |  |
Estimated Fair Value | 1,684 | 1,689
Level 1 valuation | $ 1,684 | $ 1,689

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