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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