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Investment Securities (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Investment securities available for sale [Abstract]      
Amortized Cost $ 272,791,000   $ 316,347,000
Gross Unrealized Gains 9,484,000   6,156,000
Gross Unrealized Losses 490,000   1,115,000
Estimated Fair Value 281,785,000   321,388,000
Investment securities with continuous unrealized loss position [Abstract]      
Less than 12 Months, Fair Value 42,531,000   100,108,000
12 Months or More, Fair Value 5,750,000   4,125,000
Total, Fair Value 48,281,000   104,233,000
Less than 12 Months, Unrealized Losses 425,000   1,050,000
12 Months or More, Unrealized Losses 65,000   65,000
Total, Unrealized Losses 490,000   1,115,000
Unrealized losses in investment securities 490,000    
Amortized Cost [Abstract]      
Due within one year 3,611,000    
Due from one to five years 12,117,000    
Due from five to ten years 84,014,000    
Due after ten years 13,753,000    
Mortgage-backed securities 158,548,000    
Equity securities 748,000    
Total 272,791,000    
Estimated Fair Value [Abstract]      
Due within one year 3,653,000    
Due from one to five years 12,581,000    
Due from five to ten years 89,146,000    
Due after ten years 14,864,000    
Mortgage-backed securities 160,086,000    
Equity securities 1,455,000    
Total 281,785,000    
Proceeds from sales of securities available for sale 47,062,000 72,292,000  
Gross gains on sales of securities available for sale 1,300,000 2,500,000  
Gross loss on sale of securities available for sale 103,000 9,000  
Securities pledged to secure public deposits and for other purposes, fair value 88,800,000   83,600,000
Mortgage-backed securities [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 158,548,000   213,378,000
Gross Unrealized Gains 1,982,000   1,371,000
Gross Unrealized Losses 444,000   1,056,000
Estimated Fair Value 160,086,000   213,693,000
Investment securities with continuous unrealized loss position [Abstract]      
Less than 12 Months, Fair Value 38,125,000   95,122,000
12 Months or More, Fair Value 5,750,000   4,125,000
Total, Fair Value 43,875,000   99,247,000
Less than 12 Months, Unrealized Losses 379,000   991,000
12 Months or More, Unrealized Losses 65,000   65,000
Total, Unrealized Losses 444,000   1,056,000
U.S. Government sponsored enterprises [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 1,254,000   7,429,000
Gross Unrealized Gains 40,000   265,000
Gross Unrealized Losses 0   0
Estimated Fair Value 1,294,000   7,694,000
Investment securities with continuous unrealized loss position [Abstract]      
Number of securities issued with unrealized losses 21    
State and political subdivisions [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 109,456,000   92,996,000
Gross Unrealized Gains 6,739,000   4,157,000
Gross Unrealized Losses 46,000   56,000
Estimated Fair Value 116,149,000   97,097,000
Investment securities with continuous unrealized loss position [Abstract]      
Less than 12 Months, Fair Value 4,406,000   4,444,000
12 Months or More, Fair Value 0   0
Total, Fair Value 4,406,000   4,444,000
Less than 12 Months, Unrealized Losses 46,000   56,000
12 Months or More, Unrealized Losses 0   0
Total, Unrealized Losses 46,000   56,000
Number of securities issued with unrealized losses 7    
Corporate bonds [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 1,535,000   546,000
Gross Unrealized Gains 16,000   0
Gross Unrealized Losses 0   3,000
Estimated Fair Value 1,551,000   543,000
Investment securities with continuous unrealized loss position [Abstract]      
Less than 12 Months, Fair Value     542,000
12 Months or More, Fair Value     0
Total, Fair Value     542,000
Less than 12 Months, Unrealized Losses     3,000
12 Months or More, Unrealized Losses     0
Total, Unrealized Losses     3,000
Trust preferred securities [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 1,250,000   1,250,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses 0   0
Estimated Fair Value 1,250,000   1,250,000
Equity securities [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 748,000   748,000
Gross Unrealized Gains 707,000   363,000
Gross Unrealized Losses 0   0
Estimated Fair Value $ 1,455,000   $ 1,111,000
Maximum [Member] | U.S. Government sponsored enterprises [Member]
      
Investment securities with continuous unrealized loss position [Abstract]      
Number of securities issued with unrealized losses 86    
Maximum [Member] | State and political subdivisions [Member]
      
Investment securities with continuous unrealized loss position [Abstract]      
Number of securities issued with unrealized losses 143