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6. Fair Value Measurements, Level of Hierarchy (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Estimated Fair Value | $ 293,151 | $ 297,823
Mortgage-backed securities |  |
Estimated Fair Value | 120,777 | 148,024
Level 1 valuation | 0 | 0
Level 2 valuation | 120,777 | 148,024
Level 3 valuation | 0 | 0
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 19,569 | 18,837
Level 1 valuation | 0 | 0
Level 2 valuation | 19,569 | 18,837
Level 3 valuation | 0 | 0
State and political subdivisions |  |
Estimated Fair Value | 146,464 | 125,658
Level 1 valuation | 0 | 0
Level 2 valuation | 146,464 | 125,658
Level 3 valuation | 0 | 0
Corporate bonds |  |
Estimated Fair Value | 3,490 | 2,586
Level 1 valuation | 0 | 0
Level 2 valuation | 3,490 | 2,586
Level 3 valuation | 0 | 0
Trust preferred securities |  |
Estimated Fair Value | 1,250 | 1,250
Level 1 valuation | 0 | 0
Level 2 valuation | 0 | 0
Level 3 valuation | 1,250 | 1,250
Equity securities |  |
Estimated Fair Value | 1,601 | 1,468
Level 1 valuation | 1,601 | 1,468
Level 2 valuation | 0 | 0
Level 3 valuation | $ 0 | $ 0

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