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6. Fair Value Measurements, Level of Hierarchy (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Estimated Fair Value $ 301,788 $ 297,823
Mortgage-backed securities
    
Estimated Fair Value 127,473 148,024
Level 1 valuation 0 0
Level 2 valuation 127,473 148,024
Level 3 valuation 0 0
U.S. Government sponsored enterprises
    
Estimated Fair Value 22,734 18,837
Level 1 valuation 0 0
Level 2 valuation 22,734 18,837
Level 3 valuation 0 0
State and political subdivisions
    
Estimated Fair Value 145,128 125,658
Level 1 valuation 0 0
Level 2 valuation 145,128 125,658
Level 3 valuation 0 0
Corporate bonds
    
Estimated Fair Value 3,487 2,586
Level 1 valuation 0 0
Level 2 valuation 3,487 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 1,716 1,468
Level 1 valuation 1,716 1,468
Level 2 valuation 0 0
Level 3 valuation $ 0 $ 0