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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