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Investment Securities (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Investment securities available for sale [Abstract]      
Amortized Cost $ 273,155,000   $ 316,347,000
Gross Unrealized Gains 7,998,000   6,156,000
Gross Unrealized Losses 418,000   1,115,000
Estimated Fair Value 280,735,000   321,388,000
Investment securities with continuous unrealized loss position [Abstract]      
Less than 12 Months, Fair Value 54,437,000   100,108,000
12 Months or More, Fair Value 2,979,000   4,125,000
Total, Fair Value 57,416,000   104,233,000
Less than 12 Months, Unrealized Losses 366,000   1,050,000
12 Months or More, Unrealized Losses 52,000   65,000
Total, Unrealized Losses 418,000   1,115,000
Unrealized losses in investment securities 418,000   1,115,000
Amortized Cost [Abstract]      
Due within one year 2,604,000    
Due from one to five years 13,130,000    
Due from five to ten years 80,180,000    
Due after ten years 12,070,000    
Mortgage-backed securities 164,423,000    
Equity securities 748,000    
Total 273,155,000    
Estimated Fair Value [Abstract]      
Due within one year 2,648,000    
Due from one to five years 13,489,000    
Due from five to ten years 84,321,000    
Due after ten years 12,942,000    
Mortgage-backed securities 166,021,000    
Equity securities 1,314,000    
Total 280,735,000    
Proceeds from sales of securities available for sale 34,788,000 35,269,000  
Gross gains on sales of securities available for sale 1,191,000 1,256,000  
Securities pledged to secure public deposits and for other purposes, fair value 87,200,000   83,600,000
Mortgage-backed securities [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 164,423,000   213,378,000
Gross Unrealized Gains 1,981,000   1,371,000
Gross Unrealized Losses 383,000   1,056,000
Estimated Fair Value 166,021,000   213,693,000
Investment securities with continuous unrealized loss position [Abstract]      
Less than 12 Months, Fair Value 50,288,000   95,122,000
12 Months or More, Fair Value 2,979,000   4,125,000
Total, Fair Value 53,267,000   99,247,000
Less than 12 Months, Unrealized Losses 331,000   991,000
12 Months or More, Unrealized Losses 52,000   65,000
Total, Unrealized Losses 383,000   1,056,000
U.S. Government sponsored enterprises [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 2,853,000   7,429,000
Gross Unrealized Gains 77,000   265,000
Gross Unrealized Losses 0   0
Estimated Fair Value 2,930,000   7,694,000
Investment securities with continuous unrealized loss position [Abstract]      
Number of securities issued with unrealized losses 28    
State and political subdivisions [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 102,342,000   92,996,000
Gross Unrealized Gains 5,368,000   4,157,000
Gross Unrealized Losses 35,000   56,000
Estimated Fair Value 107,675,000   97,097,000
Investment securities with continuous unrealized loss position [Abstract]      
Less than 12 Months, Fair Value 4,149,000   4,444,000
12 Months or More, Fair Value 0   0
Total, Fair Value 4,149,000   4,444,000
Less than 12 Months, Unrealized Losses 35,000   56,000
12 Months or More, Unrealized Losses 0   0
Total, Unrealized Losses 35,000   56,000
Number of securities issued with unrealized losses 4    
Corporate bonds [Member]
      
Investment securities available for sale [Abstract]      
Amortized Cost 1,539,000   546,000
Gross Unrealized Gains 6,000   0
Gross Unrealized Losses 0   3,000
Estimated Fair Value 1,545,000   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 566,000   363,000
Gross Unrealized Losses 0   0
Estimated Fair Value $ 1,314,000   $ 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 28    
Maximum [Member] | State and political subdivisions [Member]
      
Investment securities with continuous unrealized loss position [Abstract]      
Number of securities issued with unrealized losses 4