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6. Fair Value Measurements, Level of Hierarchy (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Estimated Fair Value $ 293,925 $ 297,823
Mortgage-backed securities
    
Estimated Fair Value 135,744 148,024
Level 1 valuation 0 0
Level 2 valuation 135,744 148,024
Level 3 valuation 0 0
U.S. Government sponsored enterprises
    
Estimated Fair Value 19,456 18,837
Level 1 valuation 0 0
Level 2 valuation 19,456 18,837
Level 3 valuation 0 0
State and political subdivisions
    
Estimated Fair Value 132,345 125,658
Level 1 valuation 0 0
Level 2 valuation 132,345 125,658
Level 3 valuation 0 0
Corporate bonds
    
Estimated Fair Value 3,525 2,586
Level 1 valuation 0 0
Level 2 valuation 3,525 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 1,605 1,468
Level 1 valuation 1,605 1,468
Level 2 valuation 0 0
Level 3 valuation $ 0 $ 0