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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real Estate Sales Cost, Percentage of Property Value (in hundredths) 10.00%  
Available-for-sale Securities [Abstract]    
Securities available-for-sale $ 370,293 $ 367,241 [1]
Financial Assets [Abstract]    
Securities available-for-sale 370,293 367,241 [1]
Securities held-to-maturity 125,912 101,131
Carrying Value [Member]
   
Available-for-sale Securities [Abstract]    
Securities available-for-sale 370,293 367,241
Financial Assets [Abstract]    
Cash and cash equivalents 50,646 83,303
Time deposits held in banks 710 710
Securities available-for-sale 370,293 367,241
Securities held-to-maturity 123,054 100,472
Other investments 5,815 5,637
Loans, net 744,233 739,029
Cash surrender value of life insurance policies 4,872 4,853
Financial liabilities [Abstract]    
Non-interest-bearing deposits 269,110 254,755
Interest-bearing deposits 884,651 910,051
Securities sold under agreements to repurchase 50,347 46,078
Junior subordinated debentures 15,465 15,465
Minimum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Period when new appraisals are received (in weeks) 4  
Maximum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Period when new appraisals are received (in weeks) 6  
Level 1 [Member] | Fair Value [Member]
   
Available-for-sale Securities [Abstract]    
Securities available-for-sale 0 0
Financial Assets [Abstract]    
Cash and cash equivalents 50,646 83,303
Time deposits held in banks 0 0
Securities available-for-sale 0 0
Securities held-to-maturity 0 0
Other investments 5,815 5,637
Loans, net 0 0
Cash surrender value of life insurance policies 0 0
Financial liabilities [Abstract]    
Non-interest-bearing deposits 0 0
Interest-bearing deposits 0 0
Securities sold under agreements to repurchase 50,347 46,078
Junior subordinated debentures 0 0
Level 2 [Member] | Fair Value [Member]
   
Available-for-sale Securities [Abstract]    
Securities available-for-sale 370,293 367,241
Financial Assets [Abstract]    
Cash and cash equivalents 0 0
Time deposits held in banks 0 0
Securities available-for-sale 370,293 367,241
Securities held-to-maturity 125,912 101,131
Other investments 0 0
Loans, net 0 0
Cash surrender value of life insurance policies 4,872 4,853
Financial liabilities [Abstract]    
Non-interest-bearing deposits 269,110 254,755
Interest-bearing deposits 608,583 585,510
Securities sold under agreements to repurchase 0 0
Junior subordinated debentures 8,248 8,248
Level 3 [Member] | Fair Value [Member]
   
Available-for-sale Securities [Abstract]    
Securities available-for-sale 0 0
Financial Assets [Abstract]    
Cash and cash equivalents 0 0
Time deposits held in banks 712 716
Securities available-for-sale 0 0
Securities held-to-maturity 0 0
Other investments 0 0
Loans, net 750,956 747,156
Cash surrender value of life insurance policies 0 0
Financial liabilities [Abstract]    
Non-interest-bearing deposits 0 0
Interest-bearing deposits 278,193 327,694
Securities sold under agreements to repurchase 0 0
Junior subordinated debentures 7,808 9,095
Fair Value, Measurements, Recurring [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 68,503 94,999
Obligations of state and political subdivisions 87,367 96,149
GSE mortgage-backed securities 124,142 109,487
Asset-backed securities 12,463  
Collateralized mortgage obligations: residential 47,888 41,468
Collateralized mortgage obligations: commercial 29,930 25,138
Securities available-for-sale 370,293 367,241
Financial Assets [Abstract]    
Securities available-for-sale 370,293 367,241
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 0 0
Obligations of state and political subdivisions 0 0
GSE mortgage-backed securities 0 0
Asset-backed securities 0  
Collateralized mortgage obligations: residential 0 0
Collateralized mortgage obligations: commercial 0 0
Securities available-for-sale 0 0
Financial Assets [Abstract]    
Securities available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 68,503 94,999
Obligations of state and political subdivisions 87,367 96,149
GSE mortgage-backed securities 124,142 109,487
Asset-backed securities 12,463  
Collateralized mortgage obligations: residential 47,888 41,468
Collateralized mortgage obligations: commercial 29,930 25,138
Securities available-for-sale 370,293 367,241
Financial Assets [Abstract]    
Securities available-for-sale 370,293 367,241
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 0 0
Obligations of state and political subdivisions 0 0
GSE mortgage-backed securities 0 0
Asset-backed securities 0  
Collateralized mortgage obligations: residential 0 0
Collateralized mortgage obligations: commercial 0 0
Securities available-for-sale 0 0
Financial Assets [Abstract]    
Securities available-for-sale 0 0
Fair Value, Measurements, Nonrecurring [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired Loans 1,987 2,994
Other real estate 6,968 7,369
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired Loans 0 0
Other real estate 0 0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired Loans 1,987 2,994
Other real estate 6,968 7,369
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Impaired Loans 0 0
Other real estate $ 0 $ 0
[1] Derived from audited financial statements.